JP4987391B2 - Ophthalmic equipment - Google Patents

Description

  The present invention relates to an ophthalmologic apparatus for examining an eye to be examined.

  In an ophthalmologic apparatus (for example, an auto reflex or a non-contact tonometer) that examines an eye to be examined, when performing vertical alignment between the eye to be examined and an optometry unit using a rotary knob provided on a joystick, Depending on the individual difference in the examiner's face, the eye to be examined may be located outside the movable range in the vertical direction of the optometric unit. For this reason, in the conventional apparatus, when the movement of the optometry unit reaches the limit, a limit display is displayed on the observation monitor, and it is detected that it is necessary to move the chin rest provided on the face support unit up and down. (For example, refer to Patent Document 1). When the limit display is made, the examiner moves the chin rest up and down by manually rotating the rotary knob provided in the face support unit.

In recent years, there has been known an apparatus provided with an electric switch (UP / DOWN switch) for moving the jaw holder up and down on the examiner side in order to reduce the labor of the mechanical operation as described above. In the case of such an electric switch, the examiner can also adjust the height of the chin rest while viewing the observation image displayed on the monitor.
JP-A-8-98808

  However, in the case where the height of the chin rest is adjusted while viewing the observation image displayed on the monitor using the electric switch (for example, when alignment is performed with respect to the eye to be examined), the limit position of the movable range of the measuring unit Since the direction of movement of the optometry part and the direction of operation of the switch are reversed until reaching the point, it was confusing for the examiner. For example, if the optometry unit is moved upward and the optometry unit reaches the upper limit position, the optometry unit is moved to move the chin test to position the subject eye within the movable range of the optometry unit. You have to move it down, opposite to the direction you were letting. Since the chin rest must be moved in the direction opposite to the direction in which the optometric part has been moved in this way, some inexperienced examiners may be confused about the moving direction.

  In view of the above problems, an object of the present invention is to provide an ophthalmologic apparatus that can easily adjust the position of the eye to be examined and the optometry part while looking at the anterior eye part to be examined.

  In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) an optometry unit for optometry of the eye to be examined, a first moving means for moving the optometry unit up and down,
A chin rest for receiving the subject's chin, and a second moving means for moving the chin rest up and down;
An operation means operated by an examiner to move the optometry unit in the vertical direction, the operation means also serving as an operation means for moving the chin rest in the vertical direction ;
In the predetermined vertical movement range of the optometry unit, the first movement means is driven on the basis of the operation signal of the operation means to move the optometry unit in the vertical direction, and outside the predetermined vertical movement range, the operation is performed. Drive control means for driving the second moving means based on an operation signal of the means to move the jaw holder in the vertical direction;
It is characterized by providing.
(2) The ophthalmologic apparatus according to (1) further includes detection means for detecting a vertical movement limit position in the optometry unit in order to set the predetermined vertical movement range,
The drive control means controls the drive of the second moving means based on the detection signal of the detection means.
(3) The ophthalmic apparatus according to (1)
Alignment detection means for detecting the alignment state of the optometry unit with respect to the eye to be examined, and determination means for determining whether the eye to be examined is outside a predetermined vertical movement range of the optometry unit based on the detection result of the alignment detection means Have
The drive control means controls whether or not to drive the second moving means based on the operation signal according to the determination result of the determination means.
(4) In the ophthalmic apparatus according to (1) to (3) ,
When the drive control means drives the second moving means, it is provided with notifying means for notifying the subject or the examiner of the fact.

  According to the present invention, it is possible to easily adjust the positions of the eye to be examined and the optometry part while looking at the anterior eye part to be examined.

  Embodiments according to the present invention will be described with reference to the drawings. FIG. 1 is an external configuration diagram of an ophthalmologic apparatus according to the present embodiment. The ophthalmologic apparatus is a so-called stationary ophthalmologic apparatus, and includes a base 1, a face support unit 2 attached to the base 1, a movable base 3 movably provided on the base 1, and a movable base 3 includes a measurement unit (optometry unit) 4 that is movably provided and houses an optical system to be described later. The measurement unit 4 is driven by the XZ drive unit 7 and the Y drive unit 6 provided on the movable table 3 to the left and right direction (X direction), the front and rear direction (Z direction), and the vertical direction (Y Direction). Here, when the examiner operates the joystick 5, the movable table 3 is moved in the X direction and the Z direction with respect to the base 1. Further, when the examiner rotates the rotary knob 5 a, the measurement unit 4 is moved in the Y direction by driving the Y drive unit 6. A measurement start switch 5b is provided on the top of the joystick 5. A display monitor 40 is provided on the movable table 3.

  The face support unit 2 includes a chin rest 2a for receiving the subject's chin to fix the subject's face, a drive mechanism 2b for moving the chin rest 2a in the vertical direction, and a chin rest 2b in the vertical direction. The eye level marker 2c, which serves as a measure of the height of the eye to be examined, is moved, and the chin rest 2a is moved upward or downward by driving a motor 200 built in the drive mechanism 2b. The drive mechanism 2b is provided with a detecting unit for returning the height of the chin rest 2a to a predetermined origin position.

  FIG. 2 is a schematic configuration diagram for explaining the configuration of the optical system and the control system of the ophthalmologic apparatus according to the present embodiment. On the transmitted light path O1 of the dichroic mirror 1 in front of the eye E, an eye refractive power measurement optical system 10 which is one of optometry means for observing the eye to be examined is arranged.

  In the reflection direction of the dichroic mirror 1, an objective lens 11, a dichroic mirror 12, and a total reflection mirror 13 for observing the eye E are arranged. On the optical path O2 in the reflection direction of the mirror 13, a fixation target projection optical system (not shown) for fixing the fixation target to the eye E is arranged.

  On the optical path O3 in the reflection direction of the dichroic mirror 12, the eye E is photographed including the imaging lens 20, and a two-dimensional imaging device 21 such as an area CCD disposed at a position substantially conjugate with the vicinity of the anterior segment of the eye E. An observation optical system 22 for obtaining an eye image to be examined is arranged.

  Further, a ring index projection optical system 30 that emits near-infrared light for projecting a ring index onto the cornea Ec of the eye E is disposed in front of the anterior segment of the eye E.

  Here, the dichroic mirror 1 has a characteristic of transmitting light having a wavelength emitted from a measurement light source included in the measurement optical system 10 and reflecting light having a wavelength emitted from the ring projection optical system 30 and visible light. The dichroic mirror 12 has a characteristic of transmitting visible light and reflecting infrared light. The reflected light from the anterior segment on which the ring index is projected by the ring index projection optical system 30 is received by the image sensor 21 via the dichroic mirror 1, the objective lens 11, the dichroic mirror 12, and the imaging lens 20. The

  The control unit 70 performs an operation for obtaining the eye refractive power based on the output signal from the light receiving element of the measurement optical system 10. In addition, an image signal from the image sensor 21 is input to the control unit 70. The anterior ocular segment image obtained by the image sensor 21 is displayed on the screen of the display monitor 40 after being combined (superimposed) with display information such as measurement results and alignment marks by the control unit 70. In addition, the control unit 70 also includes a memory 71 for storing data such as measurement results, a rotation knob 5a and a measurement start switch 5b of the joystick 5, an XZ drive unit 7, a Y drive unit 6, and various settings relating to inspection (measurement). An operation switch unit 45, a printer 63, and the like for performing mode switching and alignment mode switching are connected.

  In addition, the control unit 70 is connected to a detection unit that detects the movement limit positions in the vertical direction of the measurement unit 4 in order to set a predetermined vertical movement range of the measurement unit 4. For example, as shown in FIG. 2, by detecting the light shielding plate 103 provided in the Y driving unit 6, the photosensor 101a that detects that the measuring unit 4 has reached the upper limit position and that the lower limit position has been reached. A configuration having a photosensor 101b for detection is conceivable. In the present embodiment, a pulse motor is used as the motor 102 of the Y drive unit 6. By measuring the number of rotations of the motor 102 using the above-described photosensors 101 a and 101 b as reference positions, It is possible to obtain direction height position information (for example, when detecting the distance from the current position of the measurement unit 4 to the movement limit position) and to set the initial origin position of the measurement unit 4. . In the drive mechanism 2b described above, a photo sensor (not shown) and a pulse motor 200 are similarly provided, and the initial origin position of the chin rest 2a can be set.

  The operation of the ophthalmologic apparatus having the above configuration will be described. When the power of the apparatus is turned on by the examiner, the control unit 70 initializes the heights of the measurement unit 4 and the chin rest 2a to a preset initial origin position (for example, the midpoint position in the movable range). Therefore, the Y drive unit 6 and the drive mechanism 2b are driven. The initial position of the chin rest 2a is such that the height of the eye level marker 2c and the eye to be examined substantially coincide when a subject having an average face size fixes the face to the face support unit 2. It is preferable to set such a position.

  After the initialization operation is completed, the examiner instructs the subject to place his / her chin on the chin rest 2a, and performs rough alignment on the subject's eye while viewing the monitor 40. Here, the examiner operates the joystick 5 and the rotary knob 5a to move the measurement unit 4 in the XYZ directions, thereby adjusting the position so that the eye to be examined appears on the display monitor 40. In this case, the control unit 70 moves the measurement unit 4 in the vertical direction by controlling the drive of the Y drive unit 6 based on the operation signal from the rotary knob 5a. More specifically, the moving direction of the measuring unit 4 is controlled by the rotating direction of the rotating knob 5a, and the moving amount and moving speed of the measuring unit 4 are controlled by the rotating amount and rotating speed of the rotating knob 5a. In this embodiment, when the examiner rotates the rotary knob 5a clockwise, the measurement unit 4 is moved upward, and when the examiner rotates the rotary knob 5a counterclockwise, the measurement unit 4 moves downward. Is done.

  Here, since the eye E to be examined is positioned outside the range of vertical movement of the measurement unit 4, even if the measurement unit 4 is positioned at the movement limit position, alignment may not be achieved because it does not reach the eye to be examined. In this case, when the measurement unit 4 reaches the movement limit position and a detection signal from the photosensor 101a or 101b is input to the control unit 70, the control unit 70 displays a limit mark on the display monitor 40. In addition, when an operation signal from the rotary knob 5a is input in a state where the detection signal from the photosensor 101a or 101b is input to the control unit 70, the control unit 70 detects the face based on the operation signal from the rotary knob 5a. By driving and controlling the drive mechanism 2b on the support unit 2 side, the chin rest 2a is moved in the vertical direction. More specifically, the moving direction of the chin rest 2a is controlled by the rotating direction of the rotating knob 5a, and the moving amount and moving speed of the chin rest 2a are controlled by the rotating amount and rotating speed of the rotating knob 5a. In this embodiment, when the examiner rotates the rotary knob 5a clockwise, the chin rest 2a is moved downward, and when the examiner rotates the rotary knob 5a counterclockwise, the chin rest 2a moves upward. Is done.

  For example, when the examiner rotates the rotary knob 5a clockwise to move the measuring unit 4 upward and the photosensor 101a detects that the measuring unit 4 has reached the upper limit position, the control unit 70 The movement of the measuring unit 4 is stopped, and a limit mark L indicating that the measuring unit 4 has reached the upper limit (moving the chin rest downward) is displayed on the monitor 40 (see FIG. 3A). The examiner who sees this notifies the subject that the chin rest 2a is moved downward. Note that a notification means (for example, a sound generation unit) for notifying the subject or the examiner that the chin rest 2a is moved is provided in the apparatus, and the notification means is provided based on the detection signals from the photosensors 101a and 101b. You may make it operate. In this way, the chin rest 2a can be moved up and down without being surprised by the subject.

  Thereafter, when the examiner further rotates the rotary knob 5a in the same direction (clockwise), the control unit 70 switches the drive control for the Y drive unit 6 to the drive control for the drive mechanism 2b, and from the rotary knob 5a. Based on the operation signal, the chin rest 2a is moved downward. When the rotary knob 5a rotates counterclockwise with the measuring unit 4 reaching the upper limit, the drive control for the Y driving unit 6 remains unchanged, and the measuring unit 4 is moved downward.

  That is, the control unit 70 operates the rotation knob 5a in the operation direction output from the rotary knob 5a immediately before switching from the drive control for the Y drive unit 6 to the drive control for the drive mechanism 2b, and in the drive control for the switched drive mechanism 2b. When the operation direction output from the head is the same direction, the jaw holder 2a is moved in the direction opposite to the moving direction of the measuring unit 4 by the Y driving unit 6 immediately before switching.

  In this way, the examiner rotates the rotary knob 5a clockwise until the subject's eye reaches the movable range of the measuring unit 4, and the ring image R that can be regarded as the approximate corneal apex position of the subject's eye. When the center position is positioned below the reticle mark LT (see FIG. 3B), the rotary knob 5a is rotated counterclockwise to move the measuring unit 4 downward. Further, the rotary knob 5a is rotated counterclockwise to move the measuring unit 4 downward, and the rotary knob 4a is further moved in the same direction (counterclockwise) with the measuring unit 4 reaching the lower limit (movement limit position). When rotated, the control unit 70 performs control to move the chin rest 2 a upward instead of moving the measurement unit 4.

  As described above, when the alignment with respect to the subject's eye is possible, the examiner instructs the subject to fixate a fixation target (not shown) and displays a ring image (Meyer) displayed on the display monitor 40. The joystick 5 is operated while viewing the ring image) R, and the position of the measurement unit 4 is finely adjusted in the vertical and horizontal directions so that the ring image R and the reticle mark LT are concentric. Thereafter, the position of the measuring unit 4 in the working distance direction is finely adjusted with reference to an indicator (not shown) (or so that the ring image R becomes the thinnest). When the alignment is completed and the measurement start switch 5b is pushed by the examiner, measurement by the measurement optical system 10 is performed.

  According to the above configuration, even when the measuring unit 4 reaches the vertical movement limit position during observation of the anterior segment of the eye to be examined, the same operation as the immediately preceding operation is continued, so that the jaw is automatically set. The height of the receiver 2a is adjusted, and the measurement unit moves relative to the direction to be moved with respect to the eye to be examined. Positioning with the (optometry unit) can be easily performed.

  In the above description, the measurement unit 4 is configured to move the chin rest 2a by operating the rotary knob 5a using a detection signal that the measurement unit 4 has reached the limit of the movable range as a trigger. In the predetermined vertical movement range, the Y drive unit 6 is driven to move the measurement unit 4 in the vertical direction. Outside the vertical movement range of the measurement unit 4, the drive mechanism 2b is driven to move the measurement unit 4 in the vertical direction. Anything can be used. For example, based on the alignment deviation amount of the measuring unit 4 with respect to the eye to be detected detected by a predetermined method and the height position information of the measuring unit 4 at that time, the eye to be examined is outside the movable range of the measuring unit 4. Whether or not there is may be determined by calculation, and the movement of the chin rest 2a by the rotary knob 5a may be controlled based on the calculation (determination) result. In this case, for example, the distance from the height of the measurement unit 4 detected by a predetermined detection mechanism to the upper limit position or the lower limit position of the movable range of the measurement unit 4 is sequentially detected, and the detection distance and the measurement unit for the eye to be examined It is possible to determine whether or not the eye to be examined is outside the movable range of the measurement unit 4 by comparing the relative distances with the measurement optical axis 4. The alignment deviation amount of the measurement unit 4 with respect to the eye to be examined is, for example, the center coordinates of the ring index R included in the anterior eye image captured by the image sensor 21 by detecting the alignment state with respect to the eye to be examined by the image sensor 21. It is possible to detect by calculating the deviation amount with respect to the detected position and the predetermined alignment reference position.

  In the above description, the measurement unit 4 reaches the movement limit position of the movable range in the vertical direction of the measurement unit 4 by switching the movement of the measurement unit 4 and the chin rest 2a by operating the rotary knob 5a (or However, it is also possible to set a predetermined movement switching position (trigger position) at a position narrower than the movable range of the measuring unit 4. For example, a position that is 2/3 of the total distance from the center (intermediate) position of the movable range in the vertical direction of the measuring unit 4 to the movement limit is set in advance as a trigger position for movement switching, and the initial origin position When the measuring unit 4 that starts moving from the position reaches the above-mentioned 2/3 point, the object to be moved by the rotary knob 5a can be set to the chin rest 2a side. Further, in the above method, in the case of an apparatus having an automatic alignment function for automatically aligning the measuring unit 4 with respect to the eye to be examined by detecting the alignment state of the measuring unit 4 with respect to the eye to be examined, the measuring unit 4 is automatically aligned. When moving, the entire movable range of the measuring unit 4 is used, and when moving the measuring unit 4 by manual alignment using the rotary knob 5a, the movable range of the measuring unit 4 is limited to a narrow range. May be.

  In the above description, the measurement unit 4 and the chin rest 2a are moved up and down by the rotary knob 5a provided on the joystick 5. However, any operation member operated by the examiner may be used. It is not limited. For example, both the measuring unit 4 and the chin rest 2a may be moved up and down by a predetermined vertical movement button.

  In the above description, the chin rest 2a is moved up and down by operating the rotary knob 5a. However, separately from this, an electric switch (UP / DOWN switch) for moving only the chin rest up and down is provided. It may be. In this case, when the chin rest 2a is moved up and down when the subject's face is fixed to the face support unit 2, the UP / DOWN switch is used, and the measurement unit 4 reaches the limit during observation of the eye to be examined. A method of using the rotary knob 5a when moving the chin rest 2a up and down is conceivable.

It is an external appearance block diagram of the ophthalmologic apparatus which concerns on this embodiment. It is a schematic block diagram for demonstrating the structure of the optical system of the ophthalmic apparatus which concerns on this embodiment, and a control system. It is a figure which shows the alignment screen displayed on the display monitor.

Explanation of symbols

2 face support unit 2a chin rest 2b drive mechanism
4 Measurement Unit 5a Rotation Knob 6 Y Drive Unit 21 Two-Dimensional Image Sensor 40 Display Monitor 70 Control Unit

Claims (4)

An optometry unit for optometry of the eye to be examined, and a first moving means for moving the optometry unit up and down,
A chin rest for receiving the subject's chin, and a second moving means for moving the chin rest up and down;
An operation means operated by an examiner to move the optometry unit in the vertical direction, the operation means also serving as an operation means for moving the chin rest in the vertical direction ;
In the predetermined vertical movement range of the optometry unit, the first movement means is driven on the basis of the operation signal of the operation means to move the optometry unit in the vertical direction, and outside the predetermined vertical movement range, the operation is performed. Drive control means for driving the second moving means based on an operation signal of the means to move the jaw holder in the vertical direction;
An ophthalmologic apparatus comprising: The ophthalmologic apparatus according to claim 1, further comprising detection means for detecting each of movement limit positions in the vertical direction in the optometry unit in order to set the predetermined vertical movement range,
The ophthalmic apparatus characterized in that the drive control means controls driving of the second moving means based on a detection signal of the detection means. The ophthalmic apparatus according to claim 1 further comprises:
Alignment detection means for detecting the alignment state of the optometry unit with respect to the eye to be examined, and determination means for determining whether the eye to be examined is outside a predetermined vertical movement range of the optometry unit based on the detection result of the alignment detection means Have
The drive control means controls whether or not to drive the second moving means based on the operation signal in accordance with the determination result of the determination means. The ophthalmic apparatus according to claim 1 ,
An ophthalmologic apparatus comprising a notifying means for notifying the subject or the examiner when the drive control means drives the second moving means.

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