JP2011221429A - Method for selecting spectacle lens type and vision examination apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for selecting a spectacle lens type and an eyesight examination apparatus, which make it possible to easily examine an eyesight adjustment ability of a spectacle wearer and a spectacle magnification suitable for the spectacle wearer and to easily select a spectacle lens type optimum for the individual wearer based on the result of the examination.SOLUTION: A method for selecting a spectacle lens using a vision inspecting apparatus 10 includes: an adjustment ability examination step in which an examinee corrected by an astigmatism lens 12 sees a near-sight target; a lens type selection step in which a single focus lens or progressive refractive power lens is selected based on how the examinee can see the near-sight target; an eyesight examination step in which the examinee corrected by an enlarging loupe 13 sees an eyesight examination target; and a design type selection step in which an inner-surface progressive lens or inner/external-surface progressive lens is selected on the basis of whether the eyesight of the examinee is improved.

Description

  The present invention relates to a spectacle lens type selection method and a visual acuity inspection apparatus that select an optimal spectacle lens type for a spectacle wearer.

Conventionally, a technique for selecting a spectacle lens suitable for a spectacle wearer has been proposed (see, for example, Patent Document 1).
In patent document 1, the appropriateness with respect to each lens is calculated | required from several progressive multifocal lenses manufactured based on different optical designs based on the age and wearing environment of the target presbyopic eye, and based on this appropriateness Optimum lenses for the wearer are selected.

  On the other hand, for eyeglass adjustment, a visitor who visits an eyeglass dealer moves to an inspection room, etc., and performs a subjective refraction test to obtain an appropriate refractive power while comparing and confirming the appearance of the target. Precisely implemented by fitting to fit the wearer's body shape, posture and intended use.

JP-A-3-206417

Here, a description will be given of a decrease in visual acuity associated with aging and a corresponding lens type.
When a person looks at an object, the light that enters the eye is bent mainly by the cornea and the crystalline lens and gathers at one point. If the collected light, that is, the focus is on the retina, it will be in focus, but if the focus is not on the retina, the thickness of the lens is changed by the ciliary muscle so that the focus is on the retina. Make adjustments. The eye force for focusing in this way is referred to as accommodation power, and this accommodation power decreases with age. In the late 30s, the ability to adjust decreases further, making it impossible to focus when viewed from near. Thus, at the initial stage when the adjustment power starts to decrease, eye strain tends to occur because the user often tries to see an object out of focus. When the adjustment power decreases and the near-eye is not focused, the addition (convex lens effect for supplementing the adjustment power) becomes strong, and it is preferable to apply a progressive power lens.

In addition, when the lens becomes cloudy due to a change in the ophthalmic constitution with aging, light from the outside world is scattered by the lens, the imaging environment on the retina becomes worse, and the contrast sensitivity decreases. When the contrast sensitivity is lowered, particularly small characters are blurred and difficult to see. Therefore, it is preferable to apply a lens having a higher spectacle magnification.
The progressive power lens includes an inner surface progressive lens, a double-sided progressive lens, and an outer surface progressive lens depending on the position where the progressive surface is formed. These lenses have different magnifications when the spectacle wearing distance is the same, and the magnification (image enlargement ratio) increases in the order of an inner surface progressive lens, a double-sided progressive lens, and an outer surface progressive lens. Therefore, it is important to select a lens having a magnification suitable for the eye condition of the subject.

In Patent Document 1, age is used as a measure for measuring the near-sight adjustment power. However, since the eye condition varies greatly among individuals of the same age, the eye adjustment power cannot be known only by age. That is, it is difficult for the method of Patent Document 1 to select an optimum lens for the spectacle wearer.
In addition, although the eye's accommodation power and eyeglass magnification suitable for the subject can be inspected by performing precisely in an examination room or the like, such an inspection takes time and effort, so it is recommended There is a problem that it is painful for the customers who visit.

  It is an object of the present invention to easily inspect eyeglass wearer's eye accommodation power and spectacle magnification suitable for the spectacle wearer, and to easily select an optimal spectacle lens type for each person based on the inspection result A method of selecting a type and a visual acuity test apparatus are provided.

  The spectacle lens type selection method of the present invention includes an astigmatic lens, an magnifying magnifying glass, a near-field inspection target, and a visual acuity inspection target, and selects an optimal spectacle lens type for the subject. A type selection method, wherein the near-field inspection target is presented at a position where the subject can visually recognize, the astigmatism lens is disposed in front of the subject's eyes, and the subject has the astigmatism lens. If the adjustment power is determined to be sufficient based on the adjustment power inspection step of viewing the near-field inspection target through the view of the near-field inspection target by the subject, a single focus lens is selected. If it is determined that there is not enough adjustment power, the lens type selection step for selecting a progressive-power lens, and if the progressive-power lens is selected in the lens type selection step, the subject is visible. Presenting the visual acuity test target in position, and A first visual inspection step in which the subject views the visual acuity test target through the magnifier with the magnifier placed in front of the examiner's eyes; and the visual acuity at a position where the subject can visually recognize the visual acuity A second visual acuity inspection step in which the subject views the visual acuity test target in a state in which the test optotype is presented and neither the astigmatic lens nor the magnifying loupe is disposed in front of the subject's eyes; As a result of comparing the appearance of the first visual acuity inspection process and the second visual acuity inspection process by the subject, the first visual acuity inspection process has improved visual acuity than the second visual acuity inspection process. If it is determined that the visual acuity is not improved in the first visual acuity inspection process than the second visual acuity inspection process, an internal progressive lens is selected. Design type selection work Characterized by comprising a and.

According to the present invention, the appearance when the near vision target is viewed through the astigmatism lens is inspected, and it is determined whether or not the adjustment power is reduced based on the appearance. The fact that the adjustment power is reduced means that eye strain is likely to occur. Therefore, a progressive power lens that compensates for the adjustment power and can be worn more comfortably is selected. On the other hand, as long as the adjusting power is not lowered, the current status may be maintained. Therefore, the subject wearing the single focus lens selects the single focus lens as it is. It is not necessary for a naked eye subject to use a progressive-power lens if there is no reduction in accommodation power, and a single focus lens that matches the visual acuity of the subject may be selected.
In addition, a visual acuity test using an magnifying loupe is performed on a subject for which a progressive power lens is selected, and a design type of the progressive power lens is selected based on the correction effect of the magnifying loupe. The visual acuity inspection process is particularly effective for a person who uses a progressive power lens for the first time or a person who wears an internal progressive lens with a low magnification. The progressive-power lens increases in magnification in the order of an inner surface progressive lens, a double-sided progressive lens, and an outer surface progressive lens, so that a more comfortable lens type can be selected according to the visual acuity of the subject.
From the above, it is possible to easily inspect the eye's accommodation power and the spectacle magnification suitable for the subject, and it is possible to easily select the most suitable spectacle lens type for each individual based on the inspection result.

  In the spectacle lens type selection method of the present invention, the power of the astigmatic lens is preferably a cross cylinder from S + 0.50DC-1.00D to S + 3.00DC-6.00D.

  In the present invention, by adjusting the power of the astigmatic lens to a cross cylinder from S + 0.50DC-1.00D to S + 3.00DC-6.00D, it is possible to accurately inspect the individual's adjustment power. If the power of the astigmatic lens is out of the above range, the adjustment force may not be accurately inspected.

  In the spectacle lens type selection method of the present invention, the near-field inspection target has a shape in which at least one line and at least one line different from the line are orthogonal to each other, and the lens type selection step Then, the acute angle formed by projecting the astigmatic axis when the astigmatic refractive power of the astigmatism lens is expressed as a negative value onto the near-field inspection index is 30 ° or less. If the line of the near-inspection index where the acute angle with the projection line is 60 ° or more is dark, it is determined that the adjustment power is insufficient, It is preferable to determine that the adjustment power is sufficient when the near-inspection index line whose acute angle with the projection line is 30 ° or less is dark or cannot be determined.

In this invention, it is determined more accurately whether or not the adjustment force is sufficient by using a shape in which at least one line and at least one line different from this line are orthogonal to each other as the near-field inspection target. can do. Since at least one line and at least one line different from this line are just perpendicular to each other, it is easy for the examinee to determine which direction the line looks darker. Inspection can be carried out smoothly without taking time and effort.
It is most preferable that the acute angle formed by projecting the astigmatism axis on the near vision inspection index when the astigmatism refractive power of the astigmatism lens is expressed as minus is 0 ° with any of the near vision index lines. Preferably, the measurement accuracy is also improved. However, depending on the frequency of the cross cylinder used for the inspection, if the deviation is 30 ° or less, the measurement can be performed almost without any problem.

  In the spectacle lens type selection method of the present invention, a density filter is used, the visual acuity test target is presented at a position where the subject can visually recognize, the density filter is disposed in front of the subject's eyes, A first contrast inspection step in which the subject views the visual acuity test target through the density filter; and the visual acuity inspection target is presented at a position where the subject can visually recognize, and the eye is in front of the subject. A second contrast inspection step in which the subject views the visual acuity test target, the first contrast inspection step, and the second in a state in which none of the astigmatic lens, the magnifying loupe, and the density filter are disposed. When the subject determines that the first contrast inspection step has improved visual acuity than the second contrast inspection step. Selecting a color lens, and selecting a colorless lens when the subject does not determine that the first contrast inspection process has improved visual acuity over the second contrast inspection process, a color lens selection process And are preferably further provided.

In this invention, the correction effect by the density filter is inspected. That is, when the visual acuity is improved by the correction by the density filter, it means that the contrast sensitivity is lowered, and therefore the color lens is selected. In addition, the fact that the visual acuity does not improve even when correction is performed using the density filter, the contrast sensitivity is not lowered, and therefore a colorless lens is selected.
According to this, the contrast sensitivity characteristic of the individual can be easily determined by the density filter, and an optimal spectacle lens can be provided for the individual. In particular, since a result can be obtained quickly by a simple test that simply determines whether or not visual acuity has been improved by a density filter, it can be easily performed at a store and is highly useful.

  The visual acuity inspection device of the present invention includes an astigmatic lens, a magnifier magnifying glass that is not included, a state in which the astigmatic lens is disposed, a state in which the magnifier loupe is disposed, and a state in which neither the astigmatic lens nor the magnification loupe is disposed. A near-field inspection target display means for displaying a near-field inspection target at a position where it can be viewed through the astigmatic lens disposed, and a close-up inspection magnifier. Visual acuity test target display means for displaying the visual acuity test target at a position where it can be performed.

  In this invention, it is inspected whether or not the eye accommodation ability has been reduced by the astigmatic lens and the near-field test target, and an individual's visual acuity test is performed by using the magnifying loupe and the visual test target. By using an magnifying magnifying glass, it is possible to easily determine which of the progressive-power lenses, the inner surface progressive lens, the outer surface / double-sided progressive lens is suitable. In addition, since the astigmatic lens and the magnifying loupe can be easily switched by the lens switching means, it is possible to easily perform a series of examinations according to the adjustment force that decreases with age and changes in the ophthalmic constitution. Such a simple configuration of the eyesight inspection device can be installed at the storefront of an eyeglass store, so it is possible to eliminate the trouble and time of having the customer move to the inspection room etc. There is no. Furthermore, since the visual acuity inspection apparatus has a simple configuration including an astigmatic lens and an magnifying loupe, it can be manufactured at low cost and is excellent in economic efficiency.

  In the visual acuity test apparatus according to the present invention, it is preferable that the power of the astigmatic lens is a cross cylinder from S + 0.50DC−1.00D to S + 3.00DC−6.00D.

  In the present invention, by adjusting the power of the astigmatic lens to a cross cylinder from S + 0.50DC-1.00D to S + 3.00DC-6.00D, it is possible to accurately inspect the individual's adjustment power. If the power of the astigmatic lens is out of the above range, the adjustment force may not be accurately inspected.

  In the visual acuity test apparatus according to the present invention, the near-field test target has a shape in which at least one line and at least one line different from the line are orthogonal to each other, and astigmatism of the arranged astigmatism lens. It is preferable that an acute angle formed by projecting the astigmatism axis when the refractive power is expressed as a negative value onto the near-inspection index is 30 ° or less.

  In this invention, by using a shape in which at least one line and at least one line different from this line are orthogonal to each other as a near-field test target, the subject in which direction the line looks darker Therefore, it is possible to more accurately determine whether or not the adjustment force is sufficient. Moreover, since it can be easily determined for the subject, the inspection can be performed smoothly without taking time and effort.

  The visual acuity test apparatus according to the present invention further includes a density filter, wherein the lens switching unit includes the astigmatic lens, a state where the magnifying loupe is disposed, a state where the density filter is disposed, and the astigmatic lens. It is preferable that the visual acuity test index display means displays the visual acuity test target at a position where the visual acuity test index display means can be seen through the disposed density filter.

In the present invention, it is possible to inspect the correction effect by the density filter. That is, when the visual acuity is improved by the correction by the density filter, it means that the contrast sensitivity is lowered, and therefore the color lens is selected. In addition, the fact that the visual acuity does not improve even when correction is performed using the density filter, the contrast sensitivity is not lowered, and therefore a colorless lens is selected.
According to this, the contrast sensitivity characteristic of the individual can be easily determined by the density filter, and an optimal spectacle lens can be provided for the individual. In particular, since a result can be obtained quickly by a simple test that simply determines whether or not visual acuity has been improved by a density filter, it can be easily performed at a store and is highly useful.

1 is a cross-sectional view showing a schematic configuration of a visual acuity test apparatus according to a first embodiment of the present invention. The figure which shows the switching part of the lens of the visual acuity test | inspection apparatus in 1st Embodiment. The figure which shows the display content of the optotype presentation part of the visual acuity test | inspection apparatus in 1st Embodiment. The flowchart which shows the process of selecting a spectacle lens type in 1st Embodiment. The flowchart which shows the process of selecting a spectacle lens type in 1st Embodiment. Sectional drawing which shows schematic structure of the visual acuity test | inspection apparatus concerning 2nd Embodiment of this invention. The figure which shows the switching part of the lens of the visual acuity test | inspection apparatus in 2nd Embodiment. The figure which shows the display screen of the target liquid crystal part of the visual acuity test | inspection apparatus in 2nd Embodiment. The flowchart which shows the process of selecting a spectacle lens type in 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
(1. Configuration of the visual acuity test apparatus 10)
As shown in FIG. 1, the visual acuity inspection device 10 includes a pair of left and right astigmatic lenses 12 and a pair of left and right magnifying loupes 13, and a lens switching unit 14 that can switch between the astigmatic lenses 12 and the magnifying loupe 13. A target presentation unit 15 that presents a target to the subject, an illumination 16, a mirror 17, and a light shielding plate 18 are provided.
The case 11 has an inspection window 111 on the upper side for allowing a subject to look into the apparatus and observing an inspection target to be described later.

  The astigmatic lens 12 is used for examining the accommodation power of the eye. As shown in FIG. 2, the astigmatism lens 12 includes a pair of a disc-shaped left astigmatism lens 121 and a right astigmatism lens 122. The power of the astigmatic lens 12 is preferably a cross cylinder from S + 0.50DC-1.00D to S + 3.00DC-6.00D, and more preferably, a cross cylinder of S + 1.00DC-2.00DAx90 ° is used. preferable. If the power of the astigmatic lens 12 is outside the above range, it may be impossible to accurately inspect changes in the accommodation power of the eyes with aging.

  The magnifying loupe 13 is used for a visual acuity test for determining a spectacle magnification suitable for the subject. The spectacle magnification differs depending on the type of progressive-power lens, and the magnification increases in the order of an inner surface progressive lens, a double-sided progressive lens, and an outer surface progressive lens. As shown in FIG. 2, the magnifying loupe 13 includes a pair of a disk-shaped left magnifying glass 131 and a right magnifying glass 132. The magnifying loupe 13 is a lens having no degree, and the magnifying rate is 1% or more and 3% or less. In an actual progressive-power lens, the difference in magnification when comparing an inner surface progressive lens and an outer surface progressive lens of the same prescription is more than 0% and less than 3%. However, if a visual acuity test is performed using a magnifying glass with a magnification smaller than 1%, it is difficult for the subject to understand the difference between when the magnifier is used and when it is not used. An inspection should be performed. In addition, since the difference in magnification between the actual progressive-power lenses is 3% or less, it is not necessary to perform visual acuity inspection using a loupe with a magnification exceeding 3%.

  The lens switching part 14 is formed integrally with the thin shaft part 141 having a substantially circular cross section, the shaft part 141, the lens support part 142 for supporting the astigmatic lens 12, and the shaft part 141. 13 and a rotary operation unit 144 provided at the tip on both sides of the shaft part 141.

The shaft portion 141 is rotatable around the shaft.
The lens support portion 142 includes an annular left lens support portion 1421 and a right lens support portion 1422 that support the left and right astigmatic lenses 12. The left lens support portion 1421 and the right lens support portion 1422 each have a fitting portion (not shown) capable of fitting the edge of each lens on the inner peripheral side, and a part of the outer periphery is integrally formed with the shaft portion 141. Has been. The left and right lens support portions 142 are arranged so that the surfaces of the circles having the circumferences of the annular left lens support portion 1421 and the right lens support portion 1422 are in the same plane, and the center of the left and right lens support portions 142 The distance between them is the inter-pupil distance PD (for example, 60 mm) of the left and right eyes of the person.

  The loupe support portion 143 includes an annular left loupe support portion 1431 and a right loupe support portion 1432 that support the left and right enlarged loupes 13. The left loupe support portion 1431 and the right loupe support portion 1432 each have a fitting portion (not shown) that can fit the end edge of each loupe on the inner peripheral side, and a part of the outer periphery is a lens support for the shaft portion 141. The part 142 is integrally formed at a position opposite to the position where the part 142 is integrally formed. Further, the left and right loupe support portions 143 are arranged so that the surfaces of the circles having the circumferences of the annular left loupe support portion 1431 and the right loupe support portion 1432 are in the same plane, and the center of the left and right loupe support portions 143 is arranged. The distance between them is the inter-pupil distance PD (for example, 60 mm) of the left and right eyes of the person.

  The astigmatism lens 12 is fitted to the lens support portion 142, and the magnifying loupe 13 is fitted to the loupe support portion 143. The surfaces of the four lenses fitted in the lens switching unit 14 are located in the same plane. Further, the rotation operation portions 144 provided at both ends of the shaft portion 141 of the lens switching portion 14 are inserted into shaft hole portions (not shown) formed on the opposing walls of the housing 11 and project outside the housing 11. ing. Thereby, the lens switching part 14 is supported in the state bridge | crosslinked to the housing | casing 11. FIG. When the inspection is performed, the surface of the astigmatic lens 12 or the magnifying loupe 13 is arranged at a position that intersects the position where the line of sight of the subject passes by rotating the rotation operation unit 144. In the present embodiment, the astigmatic lens 12 and the magnifying loupe 13 can be switched by operating the rotation operation unit 144 and rotating the shaft portion 141 by 180 °. In addition, when it is desired to perform an inspection in a state where correction is not performed by the astigmatic lens 12 or the magnifying loupe 13, the rotation operation unit 144 may be operated to rotate the shaft portion 141 by 90 °.

The target presentation unit 15 includes a disc-shaped target plate 151 and a support shaft 152 that supports the approximate center of the target plate 151.
The target plate 151 is attached to the support shaft 152 so as to be rotatable about the support shaft 152. In addition, as shown in FIG. 3, a plurality of inspection targets are displayed along the circumference in an area within a predetermined range from the outer periphery of the target plate 151. The inspection targets include a near inspection target 15A in which a plurality of vertical lines and a plurality of horizontal lines are orthogonal to each other, and a plurality of visual acuity inspection targets 15B, 15C. 15D, 15E, 15F. It should be noted that either the vertical line or the horizontal line of the near vision target 15A is adjusted so as to be in the same direction as the axis direction of the astigmatism axis when the astigmatism refractive power of the astigmatism lens 12 is expressed as a minus sign. . In other words, in the present embodiment, the acute angle between the projection line obtained by projecting the astigmatism axis when the astigmatism refractive power of the astigmatism lens 12 is expressed on the near inspection index 15A and the horizontal line of the near inspection index 15A is 30 Orient the near-inspection visual target 15A so that it is less than or equal to °.
Here, the optotype presenting unit 15 functions as a near-inspection visual target display unit and a visual acuity test visual target display unit of the present invention.
The support shaft 152 extends and contracts while the target plate 151 is rotatably supported, and moves the target plate 151 up and down.

  The illuminator 16 irradiates light on one inspection target on the target plate 151 from an obliquely upward direction. The illumination 16 is supported by an illumination support shaft 161 extending from the target plate 151, and moves up and down as the target plate 151 moves up and down.

  The mirror 17 is provided above the optotype presenting unit 15 and is supported by a mirror support shaft protruding outside the housing 11 so that the inclination angle of the mirror surface 171 can be changed, although not shown. The inclination angle of the mirror surface 171 is set so that the reflected light from the target presentation unit 15 is reflected in the direction of the eye of the subject, and is appropriately adjusted according to the position of each member.

  The light shielding plate 18 includes a flat light shielding plate 181 provided below the inspection window 111 of the housing 11. The flat light shielding plate 181 is provided so as to be parallel to the surface direction of the optotype presenting unit 15, and the inspection window of the housing 11 prevents the light scattered by the optotype presenting unit 15 from entering the eye of the subject. It protrudes from the wall on the 111 side. Thereby, the visibility with respect to a test subject's test | inspection target improves, and it can test | inspect more accurately. Further, in order to further improve the visibility, a wall-shaped light shielding plate 182 is provided along the lower wall of the inspection window 111.

(2. Selection method of eyeglass lenses using the visual acuity test apparatus 10)
Next, a method for selecting a spectacle lens using the visual acuity test apparatus 10 will be described. The method for selecting a spectacle lens is performed by an adjustment power inspection process, a lens type selection process, a visual acuity inspection process, and a design type selection process.

First, the adjustment force inspection step and the lens type selection step will be described based on the flowchart shown in FIG. In these steps, the eye's accommodation power is examined while wearing the glasses currently worn by the subject, and a lens corresponding to the examination result is selected.
(2-1. First adjustment force inspection step)
The rotation operation unit 144 of the visual acuity test apparatus 10 is operated, and the astigmatic lens 12 is arranged so that the surface direction of the astigmatic lens 12 intersects the line of sight of the subject. In addition, the support shaft 152 is moved up and down so that the distance from the target plate 151 of the target presentation unit 15 to the inspection window 111 through the mirror 17 is 40 cm, and the near-inspection target 15A is illuminated from the illumination 16. The target plate 151 is rotated to the position where the light is irradiated (S11).
Then, the eye is viewed through the inspection window 111 while wearing the glasses actually worn by the subject, and the near-inspection target 15A is inspected through the astigmatic lens 12 in the near-viewed state (S12).

(2-2. Lens type selection process)
Next, the next determination is performed according to the state of the near-field inspection target 15A seen by the subject (S13). In the case of using the near-field test target 15A in which a plurality of vertical lines and a plurality of horizontal lines are orthogonal, there are three possible ways of viewing the subject: the horizontal lines are dark, the vertical lines are dark, and determination is impossible.
If the subject determines that the vertical line is dark or cannot be determined, the test is performed again under different conditions. That is, the support shaft 152 and the illumination 16 are moved upward so that the distance from the target plate 151 of the target presentation unit 15 through the mirror 17 to the inspection window 111 is 20 cm, and the same inspection as S12 is performed. (S14, second adjustment force inspection step).

Then, a determination is made according to the state of the near-field inspection target 15A seen by the subject (S15).
When the subject determines that the vertical line is dark or cannot be determined, it is determined that the adjustment power is sufficient. This means that the accommodation power of the subject's eyes has not decreased, and the currently worn spectacle lens is used as it is or a single focus lens is selected (S16).
On the other hand, in S13 and S15, when the subject determines that the horizontal line is dark, it is determined that the adjustment power is insufficient. In this case, the horizontal line has an acute angle of 60 ° or more with the projection line projected on the near-field inspection index 15A when the astigmatism refractive power of the astigmatism lens 12 is expressed as minus. This is because the adjustment power at the near vision is reduced, so a progressive-power lens is selected (S17). In addition, it is recommended that a person wearing a progressive power lens is replaced with a progressive power lens having a different addition power.

  Next, the visual acuity inspection process and the design type selection process will be described based on the flowchart shown in FIG. In these steps, the correction effect by the magnifying loupe 13 is inspected, and a progressive-power lens having an appropriate spectacle magnification is selected according to whether or not the visual acuity has improved.

(2-3. Visual inspection process)
In the visual acuity inspection process, the visual acuity inspection process is performed twice when the magnifying loupe 13 is not used and when it is used, and the correction effect is confirmed based on the appearance in the two processes.
First, it is determined whether or not the subject is wearing an outer surface or a double-sided progressive lens (S21).
Here, when the subject is wearing the outer surface or the double-sided progressive lens, it is not necessary to carry out the subsequent design type selection step, so the outer surface or the double-sided progressive lens is selected as it is (S28).
On the other hand, when the subject does not use the progressive addition lens or is wearing the inner surface progressive lens, the following steps for confirming the effect of correcting the spectacle magnification are performed.
The rotation operation unit 144 of the visual acuity inspection apparatus 10 is operated to rotate the shaft 141 by 90 °, and the astigmatic lens 12 and the magnifying loupe 13 are arranged at a position that does not intersect the line of sight of the subject. Further, the support shaft 152 and the illumination 16 are moved up and down so that the distance from the target plate 151 of the target presentation unit 15 through the mirror 17 to the inspection window 111 is 40 cm, and the visual inspection test target 15D is illuminated 16. The target plate 151 is rotated so as to irradiate the light from (S22). In addition, what is necessary is just to select the thing of a suitable magnitude | size according to the visual acuity of a subject as a visual acuity test | inspection target.

The eyesight inspection target 15D is confirmed while looking through the inspection window 111 while wearing the spectacles actually worn by the subject and looking near (S23).
Next, the rotation operation unit 144 is operated, the shaft unit 141 is rotated by 90 °, and the magnifying loupe 13 is disposed at a position that intersects the line of sight of the subject (S24).
Then, the eyesight inspection target 15D is viewed through the magnifying loupe 13 while looking through the inspection window 111 while wearing the glasses actually worn by the subject and viewing near (S25).

(2-4. Design type selection process)
From the appearance of the visual acuity test target 15D in S23 and S25, the subject is asked to determine whether or not the visual acuity has improved (S26). Whether or not the visual acuity has improved can be determined by whether or not the visual acuity test target 15D has become easier to see.
If the visual acuity is not improved, the inner-surface progressive lens is selected because the spectacle magnification may be small (S27). On the other hand, when the visual acuity is improved, the outer surface progressive lens or the double-sided progressive lens is selected because there is a correction effect by the spectacle magnification (S28). The selection of the outer surface progressive lens or the double-sided progressive lens is comprehensively selected including the functional surface and the economical surface.

(3. Effects of the first embodiment)
According to the first embodiment as described above, the following operational effects can be achieved.
In the adjustment power inspection process, the use of the astigmatism lens 12 of the visual acuity inspection apparatus 10 reduces the eye adjustment power of the subject wearing the currently worn spectacle lens (or the naked eye is the naked eye). It is possible to easily inspect whether or not it is.
Then, since the lens type is selected according to the obtained examination result, that is, the condition of the current eye's accommodation power of the subject, an optimal spectacle lens can be selected for each individual. For example, whether a person wearing a single focus lens or a naked eye person should replace with a progressive-power lens, and whether a person wearing a progressive-power lens should replace a progressive-power lens with a different addition power Can be accurately determined.

Further, in the visual acuity inspection process, by using the magnifying loupe 13 of the visual acuity inspection device 10, the visual acuity of the subject in a state where the progressive power lens currently worn is worn (or a naked eye is a naked eye) is reduced. It is possible to easily inspect whether or not it is.
Then, since the design type of the progressive power lens is selected according to the obtained examination result, that is, the current visual acuity of the subject, the spectacle lens type most suitable for the individual can be selected.

  Further, in the lens type selection step, after inspection at a position where the distance between the target plate 151 and the subject is 40 cm, the vertical line of the near-field inspection target is determined to be dark or indeterminate. Re-examination is performed at a position where the distance between the standard plate 151 and the subject is 20 cm. For this reason, since a more exact test result can be obtained, a more optimal spectacle lens can be selected.

Furthermore, the subject only has to look through the inspection window 111 of the visual acuity inspection apparatus 10 to determine how the inspection target is visible. In addition, since the inspection result and the optimum lens can be obtained quickly, it can be easily performed at the store without burdening the customer with time and labor.
In addition, the selection of the lens type and the design type based on the verification of inspection makes it easy to convince customers, so explanations can be made smoothly and communication can be improved.
Furthermore, since the visual acuity inspection apparatus 10 is an inexpensive part and has a simple configuration, it is excellent in economic efficiency.

[Second Embodiment]
In the second embodiment, in addition to the adjustment power inspection process, the lens type selection process, the visual acuity inspection process, and the design type selection process performed in the first embodiment, the first is that the contrast inspection process and the color lens selection process are performed. Different from the embodiment. Along with this, the configuration of the visual acuity test apparatus is also different. In addition, description is abbreviate | omitted about the structure similar to 1st Embodiment.
(1. Configuration of the visual acuity test apparatus 20)
As shown in FIG. 6, the visual acuity inspection device 20 includes a pair of left and right astigmatic lenses 12, a pair of left and right magnifying loupes 13, a pair of left and right density filters 21, an astigmatic lens 12, an magnifying loupe 13, And a lens switching unit 22 that can switch the density filter 21 and a target presentation unit 23 that presents a target to the subject. The illumination 16 and the mirror 17 have the same configuration as in the first embodiment, and the light shielding plate 18 has the flat light shielding plate 181 of the first embodiment.

The astigmatic lens 12 and the magnifying loupe 13 are the same as those used in the first embodiment.
The density filter 21 is used to inspect the contrast sensitivity. The color of the density filter 21 is not particularly limited. For example, gray can be used. The concentration is preferably 30% or less, and more preferably 15% or less in consideration of indoor use.

As shown in FIG. 7, the lens switching unit 22 includes a left lens switching unit 22A and a right lens switching unit 22B. The left lens switching unit 22A and the right lens switching unit 22B have different lens arrangements. The lens switching unit 22 will be described as the same configuration.
The lens switching unit 22 is integrally formed with the support shaft 221, a cylindrical rotating unit 222 that is rotatably mounted about the support shaft 221, and the rotating unit 222, and is arranged radially about the support shaft 221. It has four annular supports. The four support portions are a lens support portion 223 that supports the astigmatic lens 12, a loupe support portion 224 that supports the magnifying loupe 13, a filter support portion 225 that supports the density filter 21, and a blank frame portion 226. The surfaces of the respective circles having the inner periphery of these four annular support portions as the circumference are in the same plane, and the surface direction and the axial direction of the support shaft 221 are orthogonal to each other. In addition, the lens support portion 223, the loupe support portion 224, the filter support portion 225, and the blank frame portion 226 each have a fitting portion (not shown) capable of fitting the edge of each lens on the inner circumference side. Are connected to each other by connecting portions 227 that connect the rotating portion 222 to each other.

The cylindrical rotating portion 222 of the left lens switching portion 22A is fitted into a recess (not shown) formed along the outer periphery at a predetermined position from the tip of the support shaft 221, and the shaft of the support shaft 221 is in the recess. It can rotate in the clockwise direction around the direction.
The cylindrical rotating portion 222 of the right lens switching portion 22B is fitted into a recess (not shown) formed along the outer periphery at a predetermined position from the tip of the support shaft 221, and the shaft of the support shaft 221 is in the recess. It can rotate counterclockwise around the direction.
Further, the left lens switching unit 22A and the right lens switching unit 22B are the left and right support units at the position where the pair of left and right support units are closest to each other, that is, the position of the blank frame unit 226 in FIG. Are arranged so that the distance between the centers of the eyes becomes the inter-pupil distance PD (for example, 60 mm) of the left and right eyes of the person.

  In addition, the support shaft 221 is provided with a rotation operation unit (not shown) that can operate the rotation of the rotation unit 222, and the position of the support unit can be adjusted from the outside of the housing 11. When performing the inspection, it can be easily switched by operating the rotation operation portion and arranging the pair of left and right support portions at the inspection position.

The target presentation unit 23 includes a target liquid crystal unit 231 that can display an examination target and a liquid crystal support shaft 232 that supports the approximate center of the target liquid crystal unit 231.
As shown in FIG. 8, the target liquid crystal unit 231 has a liquid crystal screen on its upper surface and can display various inspection targets. The target liquid crystal unit 231 is electrically connected, and the test target displayed on the liquid crystal screen can be switched by operating a switching button (not shown) provided outside the housing 11. Examples of inspection targets include various inspection targets as shown in FIG.
The liquid crystal support shaft 232 is extendable and can move up and down while supporting the target liquid crystal unit 231.

(2. Selection method of eyeglass lenses using the visual acuity test apparatus 20)
Next, a method for selecting a spectacle lens using the visual acuity test apparatus 20 will be described. A method for selecting a spectacle lens is performed by an adjustment power inspection process, a lens type selection process, a visual acuity inspection process, a design type selection process, a contrast inspection process, and a color lens selection process. Since the adjustment power inspection process, the lens type selection process, the visual acuity inspection process, and the design type selection process are the same as those in the first embodiment, description thereof is omitted.

This will be described based on the flowchart shown in FIG. In this process, the contrast sensitivity of each person's eyes is simply inspected while wearing the glasses currently worn by the subject, and a color lens is selected according to the inspection result. That is, in the contrast inspection process, two contrast inspection processes are performed when the density filter 21 is not used and when the density filter 21 is used. In the color lens selection process, the density filter 21 is based on the appearance in the two processes. Judge the effect of correction.
(2-1. Contrast inspection process)
By operating a rotation operation unit (not shown) of the lens switching unit 22, the blank frame unit 226 is arranged at the inspection position. Further, the target liquid crystal unit 231 is moved up and down so that the distance from the target liquid crystal unit 231 through the mirror 17 to the inspection window 111 becomes 40 cm. Then, the display screen of the target liquid crystal unit 231 is irradiated with light from the illumination 16, and an appropriate visual acuity test target is displayed on the target liquid crystal unit 231 (S31).

The eyesight inspection target displayed on the display screen of the target liquid crystal unit 231 is confirmed while looking through the inspection window 111 while wearing the glasses actually worn by the subject (S32). .
Next, a rotation operation unit (not shown) of the lens switching unit 22 is operated to place the density filter 21 at the inspection position (S33).
Then, the eyesight inspection target displayed on the display screen of the target liquid crystal unit 231 through the density filter 21 while looking through the inspection window 111 in a state of wearing the glasses actually worn by the subject and viewed near. (S34).

(2-2. Color lens selection process)
Next, comparison is made between when the blank frame 226 is placed at the inspection position and the visual acuity test target is viewed (S32) and when the density filter 21 is disposed at the inspection position and the visual acuity inspection target is viewed (S34). Then, it is determined whether the visual acuity has improved when the density filter 21 is placed at the inspection position (S35). Whether or not the visual acuity has improved can be determined by whether or not the visual acuity test target is easy to see.
If the visual acuity is not improved, a colorless lens is selected because there is no correction effect by the density filter 21 (S36). On the other hand, if the visual acuity is improved, a color lens is selected because there is a correction effect by the density filter 21 (S37).
As described above, in these steps, the correction effect by the density filter 21 is confirmed, and a color lens is selected according to the effect.

(3. Effects of Second Embodiment)
According to the second embodiment as described above, the following functions and effects can be obtained in addition to the functions and effects obtained in the first embodiment.
Since the visual acuity inspection apparatus 20 includes the astigmatic lens 12, the magnifying loupe 13, the density filter 21, and the blank frame 226, the eye adjustment power, the correction effect of the spectacle magnification, and the correction effect by the density filter can be easily obtained. Can be inspected. In particular, a reduction in contrast sensitivity can be easily inspected by the correction effect of the density filter, and an optimal spectacle lens can be selected for each individual according to the inspection result.

[Modification]
In addition, this invention is not limited to the said embodiment, It cannot be overemphasized that the deformation | transformation and improvement in the range which can achieve the objective and effect of this invention are included in the content of this invention. .
For example, in the first embodiment, a plurality of visual acuity test targets 15B to 15F having different sizes are displayed on the optotype plate 151, but only a single visual acuity test target may be displayed. In the design type selection step, since it is only determined whether or not the visual acuity (easiness to see) has been improved by the correction by the magnifying loupe 13, the size of the visual acuity test target is not particularly limited.
Further, the target presentation unit 23 used in the second embodiment may be used in the first embodiment, and the target presentation unit 15 used in the first embodiment may be used in the second embodiment.

  Furthermore, in the first embodiment, in the adjustment force inspection step, after the inspection is performed at a position where the distance between the target plate 151 and the subject is 40 cm, the vertical line of the near-field inspection target is dark or cannot be determined. When the determination is made, the reexamination is performed at a position where the distance between the target plate 151 and the subject is 20 cm. However, the inspection may be performed in only one stage instead of the two stages.

In the above embodiment, the near inspection target 15A has a shape in which a plurality of vertical lines and a plurality of horizontal lines are orthogonal to each other, but is not limited thereto. That is, an acute angle formed by any line constituting the near-field inspection target and a projection line projected on the near-field inspection target when the astigmatism refractive power of the astigmatic lens 12 is expressed as a minus sign is 30 ° or less. If it is. Thereby, adjustment power can be inspected.
Further, in the above embodiment, a near-field inspection target in which one vertical line and one horizontal line are orthogonal may be used.

  The present invention can be used at eyeglass stores and the like.

  DESCRIPTION OF SYMBOLS 10, 20 ... Visual acuity test | inspection apparatus, 11 ... Housing | casing, 111 ... Examination window, 12 ... Astigmatism lens, 13 ... Magnifying loupe, 14 ... Lens switching part, 15 ... Visual target presentation part, 16 ... Illumination, 17 ... Mirror, 18 ... light shielding plate, 21 ... density filter, 22 ... lens switching unit, 23 ... target presentation unit.

Claims (8)

A spectacle lens type selection method for selecting an optimal spectacle lens type for a subject using an astigmatism lens, an magnifying loupe, a near vision test target, and a vision test target,
The near vision test target is presented at a position where the subject can visually recognize, the astigmatism lens is disposed in front of the subject's eyes, and the subject passes the astigmatism lens through the near vision test target. The adjustment test process to see,
Based on how the subject sees the near-field test target, select a single focus lens when it is determined that the adjustment power is sufficient, and progressive refraction when it is determined that the adjustment power is insufficient A lens type selection process for selecting a power lens;
When a progressive power lens is selected in the lens type selection step,
Presenting the visual acuity test optotype at a position visible to the subject and placing the magnifying loupe in front of the subject's eyes, the subject passes the magnifying visual acuity through the magnifying loupe. The first visual acuity inspection process to see,
The visual acuity test target is presented at a position visible to the subject, and the visual examination is performed by the subject in a state where neither the astigmatic lens nor the magnifying loupe is placed in front of the subject's eyes. A second visual acuity inspection process to see the target;
As a result of comparing the appearance of the first visual acuity inspection process and the second visual acuity inspection process by the subject, the first visual acuity inspection process has improved visual acuity than the second visual acuity inspection process. If it is determined that the visual acuity is not improved in the first visual acuity inspection process than the second visual acuity inspection process, an internal progressive lens is selected. And a design type selection step for selecting a spectacle lens type. The method for selecting a spectacle lens type according to claim 1,
The spectacle lens type selection method, wherein the power of the astigmatic lens is a cross cylinder from S + 0.50DC-1.00D to S + 3.00DC-6.00D. In the selection method of the spectacle lens type of Claim 1 or Claim 2,
The near-field inspection target has a shape in which at least one line and at least one line different from the line are orthogonal to each other,
In the lens type selection step,
An acute angle formed by projecting an astigmatism axis when the astigmatic refractive power of the astigmatism lens is expressed as a negative value on the near-field inspection index is 30 ° or less. To
If the near-inspection index line having an acute angle of 60 ° or more with respect to the projection line is dark, the view by the subject is determined to have insufficient adjustment power, and the view by the subject However, when the near-inspection index line whose acute angle with the projection line is 30 ° or less is dark or cannot be determined, it is determined that the adjustment power is sufficient. In the selection method of the spectacle lens type in any one of Claims 1-3,
Using a density filter,
The visual acuity test target is presented at a position visible to the subject, the density filter is disposed in front of the subject's eyes, and the subject views the visual acuity test target through the density filter. A contrast inspection process;
Presenting the visual acuity test target at a position that is visible to the subject, and not placing any of the astigmatic lens, the magnifying loupe, and the density filter in front of the subject's eyes A second contrast inspection step for viewing the visual acuity test target;
Comparing the first contrast inspection step and the second contrast inspection step, the subject has improved visual acuity in the first contrast inspection step than in the second contrast inspection step. If it is determined, a color lens is selected, and if the subject does not determine that the first contrast inspection process has improved visual acuity than the second contrast inspection process, a colorless lens is selected. A method of selecting a spectacle lens type, further comprising: a lens selection step. An astigmatic lens,
A magnifier without a degree,
A lens switching means for switching between a state in which the astigmatic lens is disposed, a state in which the magnifying loupe is disposed, and a state in which neither the astigmatic lens nor the magnifying loupe is disposed;
A near-field inspection target display means for displaying a near-field inspection target at a position where it can be seen through the arranged astigmatic lens;
A visual acuity test apparatus for displaying a visual acuity test target at a position where it can be seen through the magnified loupe. The visual acuity test apparatus according to claim 5,
The power of the astigmatism lens is a cross cylinder from S + 0.50DC-1.00D to S + 3.00DC-6.00D. In the visual acuity test apparatus according to claim 5 or 6,
The near-field inspection target has a shape in which at least one line and at least one line different from the line are orthogonal to each other,
An acute angle formed by projecting an astigmatism axis when the astigmatic refractive power of the arranged astigmatism lens is expressed as a negative value onto the near-field inspection index is 30 ° or less. An eyesight testing device characterized by In the visual acuity test apparatus according to any one of claims 5 to 7,
A density filter,
The lens switching means includes a state in which the astigmatic lens is disposed, a state in which the magnifying loupe is disposed, a state in which the density filter is disposed, and a state in which neither the astigmatic lens nor the magnifying loupe or the density filter is disposed. switching,
The visual acuity test apparatus, wherein the visual acuity test index display means displays the visual acuity test target at a position where the visual acuity test index display means can be seen through the arranged density filter.

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