TWI839114B - Corneal refractive index measurement system - Google Patents

Abstract

The present invention comprises a detection light generating unit, a first dichroic mirror and a second dichroic mirror arranged in sequence on a first optical axis; and comprises a first auxiliary reflecting unit, a first aperture, the first dichroic mirror and a light receiving unit arranged in sequence on a second optical axis, the first and second optical axes being perpendicular to each other. The present invention also comprises a sight mark generating unit, the second dichroic mirror, a second aperture and a measuring area arranged in sequence on a third optical axis, the first and third optical axes being perpendicular to each other, and the second optical axis being parallel to the third optical axis. When the detection light generating unit is controlled to emit red light, green light and blue light in sequence, the light receiving unit can measure the emission value and reflection value of different light colors respectively, and then respectively calculate the refractive index of the measuring area corresponding to different light colors. This case has the advantages of being able to conveniently obtain the corneal refractive index by opening and closing the aperture and coordinating the light colors at different times, and the device is simple, low-cost and easy to operate.

Description

Corneal refractive index measurement system

The present invention relates to a corneal refractive index measurement system, in particular, a corneal refractive index measurement system that is very convenient to obtain by opening and closing the aperture and coordinating light colors at different time sequences, and a corneal refractive index measurement system that is simple in device, low in cost and easy to operate.

The industry is well aware that corneal refractive index data can not only assist ophthalmologists in assessing the condition of the eye, but can also be used as a reference for the difference in vision before and after surgery (e.g. corneal surgery).

When the eye has a disease, the corneal refractive index may also change. When a general optical instrument measures an object (such as an optical lens), it must be moved to the measurement area of the optical instrument. However, it is impossible to remove the cornea of the human eye from the eyeball and move it to the measurement area of the optical instrument for measurement. Therefore, there is currently no convenient and accurate device for measuring the refractive index of the cornea of the human eye.

In view of this, it is necessary to develop technology that can solve the above-mentioned shortcomings.

The purpose of the present invention is to provide a corneal refractive index measurement system, which has the advantages of being very convenient to obtain the corneal refractive index by opening and closing the aperture to match the light color of different time sequences, and being simple, low-cost and easy to operate. In particular, the problem that the present invention aims to solve is that when the eye has a disease, the corneal refractive index may also change. When a general optical instrument measures an object (such as an optical lens), it must be moved to the measurement area of the optical instrument. However, the cornea of the human eye cannot be removed from the eyeball and moved to the measurement area of the optical instrument for measurement. Therefore, there is currently no convenient and accurate device for the corneal refractive index of the human eye.

The technical means to solve the above-mentioned problem is to provide a corneal refractive index measurement system, which includes: a detection light generating part, which is used to emit a first light beam along a first optical axis, and the first light beam is one of red light, green light and blue light; a first spectroscope, which is arranged on the first optical axis corresponding to the detection light generating part, and the first spectroscope has the characteristics of partial reflection and partial transmission; a second spectroscope, which is arranged on the first optical axis corresponding to the first spectroscope, and the second spectroscope has the characteristics of partial reflection and partial transmission; a first aperture, which is arranged corresponding to the first spectroscope, and the first aperture can be in a first open position and a first closed position. a second aperture corresponding to the second dichroic mirror, the second aperture being switchable between a second open position and a second closed position, and the second aperture being used to correspond to a measuring area; a first auxiliary reflection portion being provided corresponding to the first aperture; a light receiving portion being provided corresponding to the first dichroic mirror; a sight mark generating portion being provided corresponding to the second dichroic mirror, the sight mark generating portion having a sight mark, and being able to allow the eye to focus on the sight mark through the measuring area, the second aperture at the second open position, and the second dichroic mirror; and the detection light generating portion, the first dichroic mirror, and the second dichroic mirror being provided in sequence on the first optical axis; the first The auxiliary reflection part, the first aperture, the first dichroic mirror and the light receiving part are used to be arranged on a second optical axis in sequence, and the first optical axis and the second optical axis are perpendicular to each other; the sight mark generating part, the second dichroic mirror, the second aperture and the measuring area are used to be arranged on a third optical axis in sequence, and the first optical axis and the third optical axis are perpendicular to each other, and the second optical axis and the third optical axis are parallel to each other; and a control part is electrically connected to the detection light generating part, the first aperture, the second aperture and the light receiving part, and is used to control the actions of the aforementioned components; thereby, the light receiving part has the following measurement modes: [a] red light emission measurement mode: when the first aperture is located at the first When the first light beam is in the open position, the second aperture is in the second closed position, and the first light beam is red light, the first light beam is irradiated to the first spectroscope and is partially reflected and partially penetrated; the first light beam becomes a second light beam after partial reflection, and becomes a third light beam after partial penetration; the second light beam passes through the first aperture and irradiates the first auxiliary reflection part, and then reflects from the first auxiliary reflection part to become a through-reflected light beam, the through-reflected light beam passes through the first aperture and penetrates the first spectroscope in reverse order to become a reflected light beam, the reflected light beam is irradiated to the light receiving part, and the light receiving part measures a red light emission value ( R _{O )} of the reflected light beam. ) and transmitted to the control unit; and the third light beam is irradiated to the second spectroscope and then reflected to become a fourth light beam, and the fourth light beam is shielded by the second aperture and does not function; [b] Red light reflection measurement mode: when the first aperture is in the first closed position, and the second aperture is in the second open position, and the first light beam is red light, the first light beam is irradiated to the first spectroscope and is partially reflected and partially penetrated; after partial reflection, it becomes the second light beam, and after partial penetration, it becomes the first light beam. Three light beams; the second light beam is shielded by the first aperture and does not work, the third light beam is irradiated to the second spectroscope and then reflected to become a fourth light beam, the fourth light beam passes through the second aperture and irradiates the measuring area, the fourth light beam is reflected from the measuring area and then becomes a fifth light beam, the fifth light beam reversely passes through the second aperture and irradiates the second spectroscope and then reflects to become a sixth light beam, the sixth light beam is irradiated to the first spectroscope and then reflected to become a seventh light beam, the seventh light beam is irradiated to the light receiving unit, the light receiving unit measures _a red light reflection value ( RI ) of the seventh light beam and transmits it to the control unit; the control unit is according to the following (Formula 1):

_A red light refractive index ( nR ) of the measurement area is calculated; [c] red light pause mode; the first aperture is located at the first closed position, the second aperture is located at the second open position, and the detection light generating unit pauses to emit the first light beam; [d] green light emission measurement mode: the same as the aforementioned [a] red light emission measurement mode, and the first light beam is green light, the light receiving unit measures a green light emission value ( GO ₎ of the reflected light beam and transmits it to the control unit; [e] green light reflection measurement mode: the same as the aforementioned [b] red light reflection measurement mode, and the first light beam is green light, the light receiving unit measures a green light reflection value ( GI ₎ of the seventh light beam and transmits it to the control unit; the control unit is in accordance with the following (Formula 2):

_A green light refractive index ( nG ) of the measuring area is calculated; [f] green light pause mode; the first aperture is located at the first closed position, the second aperture is located at the second open position, and the detection light generating unit pauses to emit the first light beam; [g] blue light emission measurement mode: the same as the aforementioned [a] red light emission measurement mode, and the first light beam is blue light, the light receiving unit measures a blue light emission value ( BO ₎ of the reflected light beam and transmits it to the control unit; [h] blue light reflection measurement mode: the same as the aforementioned [b] red light reflection measurement mode, and the first light beam is blue light, the light receiving unit measures a blue light reflection value ( BI ₎ of the seventh light beam and transmits it to the control unit; the control unit is in accordance with the following (Formula 3):

A blue light refractive index ( n _B ) of the measuring area is calculated; and [i] a blue light pause mode; the first aperture is located at the first closed position, the second aperture is located at the second open position, and the detection light generating unit pauses to emit the first light beam.

The above-mentioned purposes and advantages of the present invention can be easily understood from the detailed description and accompanying drawings of the following selected embodiments.

The present invention is described in detail with the following embodiments and accompanying drawings:

10: Detection light generation unit

11: Light emitting device

12: Light filtering components

121: Red light filter

122: Green light filter

123: Blue light filter

124: Turntable drive structure

21: The first spectroscope

22: Second spectroscope

31: First aperture

32: Second aperture

41: First auxiliary reflection unit

42: Second auxiliary reflection unit

421: Hollow plate

422: Reflection plate

423: Drive unit

50: Light receiving unit

51: Photodetector

52: Amplifier circuit

53: Filter circuit

60: Visual mark generation department

61: sight mark

70: Control Department

91: Cornea to be tested

A1: First optical axis

A2: Second optical axis

A3: The third optical axis

L1: First beam

L2: Second beam

L21: Reflected beam after passing through

L22: Reflected beam

L3: The third beam

L4: The fourth beam

L5: The fifth beam

L6: The sixth beam

L7: The seventh beam

P1: First opening position

P2: First closed position

PA: Second opening position

PB: Second closed position

P: Measurement area

T1: First time sequence

T2: Second time sequence

T3: The third time sequence

T4: The fourth time series

T5: The fifth time series

T6: The sixth time series

T7: The seventh time sequence

T8: The eighth time sequence

T9: The Ninth Time Series

Figure 1 is a schematic diagram of an embodiment of the present invention.

Figure 2 is a block diagram of one of the measurement processes of the present invention.

Figure 3 is a block diagram of the second measurement process of the present invention.

Figure 4 is a block diagram of the third measurement process of the present invention.

Figure 5 is a timing diagram of the measurement process of the present invention.

Figure 6 is a schematic diagram of an embodiment of the visual mark generating unit of the present invention.

Referring to FIG. 1, the present invention is a corneal refractive index measurement system, which includes: A detection light generating unit 10, which is used to emit a first light beam L1 along a first optical axis A1 (as shown in FIG. 2), and the first light beam L1 is one of red light, green light and blue light.

A first spectroscope 21 is disposed on the first optical axis A1 corresponding to the detection light generating section 10. The first spectroscope 21 has the characteristics of partial reflection and partial transmission.

A second beam splitter 22 is disposed on the first optical axis A1 corresponding to the first beam splitter 21. The second beam splitter 22 has the characteristics of partial reflection and partial transmission.

A first aperture 31 is provided corresponding to the first beam splitter 21, and the first aperture 31 can be switched between a first open position P1 (as shown in Figures 2 and 3) and a first closed position P2 (as shown in Figure 4).

A second aperture 32 is provided corresponding to the second beam splitter 22. The second aperture 32 can be switched between a second open position PA (as shown in FIG. 4) and a second closed position PB (as shown in FIG. 2 and FIG. 3), and the second aperture 32 is used to correspond to a measuring area P.

A first auxiliary reflection portion 41 is provided corresponding to the first aperture 31.

A light receiving unit 50 is provided corresponding to the first spectroscope 21.

A sight mark generating unit 60 is provided corresponding to the second dichroic mirror 22. The sight mark generating unit 60 has a sight mark 61, and can provide visual attention to the sight mark 61 through the measuring area P, the second aperture 32 located at the second opening position PA, and the second dichroic mirror 22. In addition, the detection light generating unit 10, the first dichroic mirror 21, and the second dichroic mirror 22 are sequentially arranged on the first optical axis A1. The first auxiliary reflection unit 41, the first aperture 31, the first dichroic mirror 21, and the light receiving unit 50 are used to be sequentially arranged on a second optical axis A2, and the first optical axis A1 and the second optical axis A2 are perpendicular to each other. The sight mark generating portion 60, the second dichroic mirror 22, the second aperture 32 and the measuring area P are sequentially arranged on a third optical axis A3, the first optical axis A1 and the third optical axis A3 are perpendicular to each other, and the second optical axis A2 and the third optical axis A3 are parallel to each other.

A control unit 70 is electrically connected to the detection light generating unit 10, the first aperture 31, the second aperture 32 and the light receiving unit 50, and is used to control the actions of the aforementioned components.

Thus, the light receiving unit 50 has the following measurement modes:

[a] Red light emission measurement mode: When the first aperture 31 is located at the first open position P1 (as shown in FIGS. 2 and 3 ), and the second aperture 32 is located at the second closed position PB, and the first light beam L1 is red light, the first light beam L1 is irradiated to the first beam splitter 21 and is partially reflected and partially transmitted; after partial reflection, it becomes a second light beam L2, and after partial transmission, it becomes a third light beam L3. The second light beam L2 passes through the first aperture 31 and then irradiates the first auxiliary reflection part 41 (as shown in FIG. 3 , and in order to avoid the disorder of the light beam path, the third light beam L3 in FIG. 3 is omitted and not shown, and it is necessary to explain it in advance.), and then reflects from the first auxiliary reflection part 41 to become a passing reflected light beam L21, and the passing reflected light beam L21 passes through the first aperture 31 and the first spectroscope 21 in reverse order to become a reflected light beam L22, and the reflected light beam L22 is irradiated to the light receiving part 50, and the light receiving part 50 measures a red light emission value ( RO ) of the reflected light beam _L22 and transmits it to the control part 70.

The third light beam L3 is irradiated to the second beam splitter 22 and then reflected to become a fourth light beam L4. The fourth light beam L4 is shielded by the second aperture 32 and does not function.

[b] Red light reflection measurement mode: When the first aperture 31 is located at the first closed position P2 (as shown in FIG. 4, and to avoid the disorder of the light beam path, the second light beam L2 in FIG. 4 is omitted and not shown, and it is necessary to explain it in advance.), and the second aperture 32 is located at the second open position PA, and the first light beam L1 is red light, the first light beam L1 is irradiated to the first beam splitter 21 and is partially reflected and partially penetrated; after partial reflection, it becomes the second light beam L2 (refer to FIG. 2), and after partial penetration, it becomes the third light beam L3. The second light beam L2 is shielded by the first aperture 31 and does not work. The third light beam L3 is irradiated to the second beam splitter 22 and then reflected to become a fourth light beam L4. The fourth light beam L4 passes through the second aperture 32 and irradiates the measurement area P. The fourth light beam L4 is reflected from the measuring area P to become a fifth light beam L5. The fifth light beam L5 passes through the second aperture 32 in the reverse direction and is irradiated to the second beam splitter 22 and then reflected to become a sixth light beam L6. The sixth light beam L6 is irradiated to the first beam splitter 21 and then reflected to become a seventh light beam L7. The seventh light beam L7 is irradiated to the light receiving unit _50. The light receiving unit 50 measures a red light reflection value ( RI ) of the seventh light beam L7 and transmits it to the control unit 70. The control unit 70 is based on the following (Formula 1):

A red light refractive index ( n _R ) of the measurement area P is calculated.

[c] Red light pause mode; the first aperture 31 is located at the first closed position P2, and the second aperture 32 is located at the second open position PA, and the detection light generating unit 10 pauses emitting the first light beam L1.

[d] Green light emission measurement mode: Same as the aforementioned [a] red light emission measurement mode, and the first light beam L1 is green light. The light receiving unit 50 measures a green light emission value ( GO ) of the reflected light beam _L22 and transmits it to the control unit 70.

[e] Green light reflection measurement mode: Same as the aforementioned [b] red light reflection measurement mode, and the first light beam L1 is green light, the light receiving unit 50 measures a green light reflection value ( GI ₎ of the seventh light beam L7 and transmits it to the control unit 70.

The control unit 70 is as follows (Formula 2):

A green light refractive index ( n _G ) of the measurement area P is calculated.

[f] Green light pause mode; the first aperture 31 is located at the first closed position P2, the second aperture 32 is located at the second open position PA, and the detection light generating unit 10 pauses emitting the first light beam L1.

[g] Blue light emission measurement mode: Same as the aforementioned [a] red light emission measurement mode, and the first light beam L1 is blue light. The light receiving unit 50 measures a blue light emission value ( BO ) of the reflected light beam _L22 and transmits it to the control unit 70.

[h] Blue light reflection measurement mode: Same as the aforementioned [b] red light reflection measurement mode, and the first light beam L1 is blue light, the light receiving unit 50 measures a blue light reflection value ( BI ₎ of the seventh light beam L7 and transmits it to the control unit 70 .

The control unit 70 is as follows (Formula 3):

A blue light refractive index ( n _B ) of the measurement area P is calculated.

[i] Blue light pause mode; the first aperture 31 is located at the first closed position P2, the second aperture 32 is located at the second open position PA, and the detection light generating unit 10 pauses emitting the first light beam L1.

In practice, the detection light generating unit 10 may include a light emitting device 11 and a light filtering assembly 12 (as shown in FIG. 1 ). The light emitting device 11 and the light filtering assembly 12 are distributed along the first optical axis A1, and the light emitting device 11 is used to emit the first light beam L1. The light filtering assembly 12 includes a red light filter 121, a green light filter 122, a blue light filter 123, and a turntable driving structure 124. The red light filter 121, the green light filter 122 and the blue light filter 123 constitute a filter turntable, and the filter turntable is divided into three equal parts. The turntable driving structure 124 is electrically connected to the control unit 70. The control unit 70 drives the filter turntable to rotate through the turntable driving structure 124. In addition, when the filter turntable rotates at least one circle, the red light filter 121, the green light filter 122 and the blue light filter 123 are sequentially vertically corresponding to the first optical axis A1, and can filter the first light beam L1 into one of red light, green light and blue light in sequence.

The ratio of partial reflection and partial transmission of the first beam splitter 21 is 50% and 50% respectively.

The ratio of partial reflection and partial transmission of the second beam splitter 22 is 50% and 50% respectively.

The first auxiliary reflective portion 41 can be a corner cube or a plane reflective mirror.

The light receiving unit 50 at least includes a light detector 51, an amplifier circuit 52 and a filter circuit 53 which are electrically connected in sequence (actually, it may also include a related calculation processing unit).

The light detector 51 is used to receive the optical signal of at least one of the reflected light beam L22 and the seventh light beam L7, and convert the optical signal into an electrical signal and output it.

The amplifier circuit 52 is used to receive the electrical signal of at least one of the reflected light beam L22 and the seventh light beam L7 output by the light detector 51, and amplify the signal before outputting it.

The filter circuit 53 is used to receive the electrical signal of at least one of the reflected light beam L22 and the seventh light beam L7 output by the amplifier circuit 52, and output it after filtering the noise of the electrical signal.

The sight mark generating portion 60 can be a non-optical structure or an optical structure. Regardless of whether it is a non-optical structure or an optical structure, the configuration of FIG. 6 can be referred to.

When the sight mark generating portion 60 is a non-optical structure, the sight mark 61 can be at least one of text, pattern, and number that is pasted, sprayed, or printed on the sight mark generating portion 60.

When the visual mark generating unit 60 is an optical structure, it is electrically connected to the control unit 70, and the visual mark generating unit 60 can be an image display or a projection display screen, and the visual mark 61 can be at least one of the text, pattern, and number displayed on the visual mark generating unit 60 controlled by the control unit 70.

The measurement area P is provided with a cornea 91 to be measured (as shown in FIG. 4 ) therein, and the red light reflection value ( R _I ), the green light reflection value ( G _I ), and the blue light reflection value ( B _I ) are all reflection values of the cornea 91 to be measured.

Furthermore, the present invention may further include: a second auxiliary reflection portion 42 disposed on the third optical axis A3 and between the second aperture 32 and the measuring area P. The second auxiliary reflection portion 42 includes a transparent disk portion 421 , a reflection disk portion 422 and a disk driving portion 423 . The transparent disk portion 421 and the reflective disk portion 422 constitute an auxiliary turntable, and the auxiliary turntable is divided into two equal parts. The disk driving portion 423 is electrically connected to the control portion 70, and the control portion 70 drives the auxiliary turntable to rotate through the disk driving portion 423. In addition, when the auxiliary turntable rotates at least one circle, the transparent disk portion 421 and the reflective disk portion 422 are sequentially vertically corresponding to the third optical axis A3.

Thus, when the transparent disk portion 421 corresponds to the third optical axis A3, the fourth light beam L4 is allowed to pass through and illuminate the measuring area P.

When the reflective disk portion 422 corresponds to the third optical axis A3, it is used to reflect the fourth light beam L4.

The actual operation of this case is divided into two stages:

[A] The first stage is the "calibration and adjustment stage before use": At this time, the subject has not yet entered the measurement area P (more specifically, the cornea 91 to be measured has not yet been located in the measurement area P). First, the control unit 70 drives the auxiliary turntable through the disk drive unit 423, so that the reflective disk unit 422 corresponds to the third optical axis A3 to perform system calibration, and then confirm that each light beam irradiated to the light receiving unit 50 and the measurement area P (whether irradiated or reflected) has not deviated from each optical axis. In more detail, the movement of the first aperture 31 and the second aperture 32 can be used for calibration of the system optical axis. In addition, another correction aperture (not shown in the figure, explained earlier) can be added between the first beam splitter 21 and the second beam splitter 22 to calibrate the system optical axis.

[B] The second stage is the "actual measurement stage": At this time, the subject needs to be positioned (to be more specific, the cornea 91 to be measured should be located in the measurement area P). And the auxiliary turntable is driven by the disk driving part 423 to change the transparent disk part 421 to correspond to the third optical axis A3 (i.e. without any obstruction).

The control unit 70 controls the detection light generating unit 10 to sequentially emit the first light beam L1 of red, green and blue light, and measures one round with each specific light color, and the measured time of changing each specific light color is 1 second, so the total measurement time is 3 seconds. Then, the pulse width modulation technology is used to control the detection light generating unit 10 to emit each specific light color (that is, one of RGB) to be shortened to 1/10 second, and the remaining 9/10 seconds do not emit a specific light color so that the eyes of the subject can focus on the visual mark 61. The timing control of the aforementioned pulse width modulation technology can be referred to Figure 5, which is explained as follows:

The first timing T1: is used for red light emission measurement mode.

The second timing T2: is used for red light reflection measurement mode.

The third timing sequence T3 is used to perform the red light pause mode, so that the subject's line of sight is not irradiated by the first light beam L1, so that the subject can look at the sight mark 61 in a relaxed manner.

The fourth timing sequence T4 is used for green light emission measurement mode.

The fifth timing sequence T5: is used to perform green light reflection measurement mode.

The sixth timing sequence T6 is used to perform the green light pause mode, so that the subject's line of sight is not irradiated by the first light beam L1, so that the subject can look at the sight mark 61 in a relaxed manner.

The seventh timing sequence T7: is used to perform blue light emission measurement mode.

The eighth timing sequence T8: is used to perform the blue light reflection measurement mode.

The ninth timing sequence T9 is used to enter the blue light pause mode, so that the subject's vision is not irradiated by the first light beam L1, and the subject can watch the visual mark 61 in a relaxed manner.

Furthermore, assuming that when _the first detection is performed, the first _{light beam L1 is red light: the red light emission value (RO} ) = 100; and the red light reflection value ( RI ) = 2.49.

Then the control unit 70 follows the following (Formula 1):

即可計算出該紅光折射率(n _R )=1.375。

The refractive index of red light can be calculated as ( n _R ) = 1.375.

Similarly, the green light refractive index ( n _G ) and the blue light refractive index ( n _B ) can be calculated.

Of course, N rounds of measurement can be performed for each specific light color, and then the refractive index of the specific light color (assuming red light) of the N rounds can be summed up and averaged to obtain the average refractive index of the cornea 91 to be measured corresponding to different specific light colors (assuming red light).

In addition, the aforementioned red light, green light and blue light can be selected from the wavelength ranges of 656.3 (±10%) nm, 587.56 (±10%) nm and 486.1 (±10%) nm respectively.

Furthermore, before the "actual measurement phase", an object with known optical properties (such as BK7 optical glass) can be used to pre-test the accuracy of the case. When the test environment is 20 degrees Celsius and an atmospheric pressure, the refractive index of BK7 optical glass under red light, green light, and blue light is 1.5143 (R), 1.5168 (G), and 1.52237 (B), respectively. Therefore, the refractive index measured by the BK7 optical glass can be used to check whether it is accurate; if there is an inaccurate value, the calibration reference value of the aforementioned inaccurate value can still be obtained indirectly.

In addition, since corneal refractive index is one of the factors that affect vision, and ophthalmic laser surgery (e.g. cataract) may cause changes in corneal refractive index. Therefore, before and after laser surgery, corneal refractive index can be further measured based on this case to serve as relevant data for surgery and auxiliary reference before and after vision correction.

The advantages and effects of the present invention can be summarized as follows:

[1] It is very convenient to calculate the refractive index of the cornea by opening and closing the aperture in combination with the light colors of different timings. In this case, by controlling the opening and closing of the aperture on different optical axes and the timing of the pulse control light beam, and adjusting the light color with the filter component, the refractive index of the cornea corresponding to different light colors can be calculated with the formula, which is very convenient. Therefore, it is very convenient to calculate the refractive index of the cornea by opening and closing the aperture in combination with the light colors of different timings.

[2] The device is simple, low-cost and easy to operate. The light emitting device, the filter assembly, the two apertures, the two dichroic mirrors, the two auxiliary reflectors, the light receiving unit and the visual mark generating unit are all known devices and do not need to be developed separately. The cost is low and the actual operation only requires illuminating and capturing the light signal and then performing signal conversion, signal amplification and signal filtering (all of which are quite basic signal processing). Therefore, the device is simple, low-cost and easy to operate.

The above is only a detailed description of the present invention through a preferred embodiment. Any simple modification and change made to the embodiment does not deviate from the spirit and scope of the present invention.

10: Detection light generation unit

11: Light emitting device

12: Light filtering components

121: Red light filter

122: Green light filter

123: Blue light filter

124: Turntable drive structure

21: The first spectroscope

22: Second spectroscope

31: First aperture

32: Second aperture

41: First auxiliary reflection unit

42: Second auxiliary reflection unit

421: Hollow plate

422: Reflection plate

423: Drive unit

50: Light receiving unit

60: Visual mark generation department

61: sight mark

70: Control Department

91: Cornea to be tested

A1: First optical axis

A2: Second optical axis

A3: The third optical axis

P: Measurement area

Claims (8)

A corneal refractive index measurement system includes: a detection light generating unit, which is used to emit a first light beam along a first optical axis, wherein the first light beam is one of red light, green light and blue light; a first spectroscope, which is arranged on the first optical axis corresponding to the detection light generating unit, and has the characteristics of partial reflection and partial transmission; a second spectroscope, which is arranged on the first optical axis corresponding to the first spectroscope, and has the characteristics of partial reflection and partial transmission; a first aperture, which is arranged corresponding to the first spectroscope, and can be switched between a first open position and a first closed position; a second aperture, which is The optical detector is provided in accordance with the second spectroscope, the second aperture can be switched between a second open position and a second closed position, and the second aperture is used to correspond to a measuring area; a first auxiliary reflection part is provided in accordance with the first aperture; a light receiving part is provided in accordance with the first spectroscope; a visual mark generating part is provided in accordance with the second spectroscope, the visual mark generating part has a visual mark, and can provide the visual line to focus on the visual mark through the measuring area, the second aperture located in the second open position and the second spectroscope; and the detection light generating part, the first spectroscope and the second spectroscope are provided in sequence on the first optical axis; the first auxiliary reflection part, the first optical mark generating part and the second spectroscope are provided in accordance with the first optical axis. An aperture, the first beam splitter and the light receiving unit are used to be arranged on a second optical axis in sequence, and the first optical axis and the second optical axis are perpendicular to each other; the sight mark generating unit, the second beam splitter, the second aperture and the measuring area are used to be arranged on a third optical axis in sequence, and the first optical axis and the third optical axis are perpendicular to each other, and the second optical axis and the third optical axis are parallel to each other; and a control unit is electrically connected to the detection light generating unit, the first aperture, the second aperture and the light receiving unit, and is used to control the actions of the aforementioned components; thereby, the light receiving unit has the following measurement modes: [a] Red light emission measurement mode: when the first aperture is located at the first opening position , and the second aperture is located at the second closed position, and when the first light beam is red light, the first light beam is irradiated to the first spectroscope and is partially reflected and partially penetrated; the first light beam becomes a second light beam after partial reflection, and becomes a third light beam after partial penetration; the second light beam passes through the first aperture and irradiates the first auxiliary reflection part, and then reflects from the first auxiliary reflection part to become a through-reflected light beam, the through-reflected light beam passes through the first aperture and penetrates the first spectroscope in reverse order to become a reflected light beam, the reflected light beam is irradiated to the light receiving part, and the light receiving part measures a red light emission value ( R _{O )} of the reflected light beam. ), and transmitted to the control unit; and the third light beam is irradiated to the second dichroic mirror and then reflected to become a fourth light beam, and the fourth light beam is shielded by the second aperture and does not function; [b] Red light reflection measurement mode: when the first aperture is in the first closed position, and the second aperture is in the second open position, and the first light beam is red light, the first light beam is irradiated to the first dichroic mirror and is partially reflected and partially penetrated; after partial reflection, it becomes the second light beam, and after partial penetration, it becomes the third light beam; the second light beam is shielded by the second aperture and does not function; The first aperture is shielded and does not work. The third light beam is irradiated to the second spectroscope and then reflected to become a fourth light beam. The fourth light beam passes through the second aperture and irradiates the measuring area. The fourth light beam is reflected from the measuring area and then becomes a fifth light beam. The fifth light beam passes through the second aperture in the opposite direction and irradiates the second spectroscope and then reflects to become a sixth light beam. The sixth light beam is irradiated to the first spectroscope and then reflected to become a seventh light beam. The seventh light beam is irradiated to the light receiving unit. The light receiving unit measures a red light reflection value ( RI ₎ of the seventh light beam and transmits it to the control unit. The control unit is in accordance with the following (Formula 1):

_A red light refractive index ( nR ) of the measurement area is calculated; [c] red light pause mode; the first aperture is located at the first closed position, the second aperture is located at the second open position, and the detection light generating unit pauses to emit the first light beam; [d] green light emission measurement mode: the same as the aforementioned [a] red light emission measurement mode, and the first light beam is green light, the light receiving unit measures a green light emission value ( GO ₎ of the reflected light beam and transmits it to the control unit; [e] green light reflection measurement mode: the same as the aforementioned [b] red light reflection measurement mode, and the first light beam is green light, the light receiving unit measures a green light reflection value ( GI ₎ of the seventh light beam and transmits it to the control unit; the control unit is in accordance with the following (Formula 2):

_A green light refractive index ( nG ) of the measuring area is calculated; [f] green light pause mode; the first aperture is located at the first closed position, the second aperture is located at the second open position, and the detection light generating unit pauses to emit the first light beam; [g] blue light emission measurement mode: the same as the aforementioned [a] red light emission measurement mode, and the first light beam is blue light, the light receiving unit measures a blue light emission value ( BO ₎ of the reflected light beam and transmits it to the control unit; [h] blue light reflection measurement mode: the same as the aforementioned [b] red light reflection measurement mode, and the first light beam is blue light, the light receiving unit measures a blue light reflection value ( BI ₎ of the seventh light beam and transmits it to the control unit; the control unit is in accordance with the following (Formula 3):

A blue light refractive index ( n _B ) of the measuring area is calculated; and [i] a blue light pause mode; the first aperture is located at the first closed position, the second aperture is located at the second open position, and the detection light generating unit pauses to emit the first light beam. A corneal refractive index measurement system as described in claim 1, wherein: the detection light generating section includes a light emitting device and a light filtering assembly, the light emitting device and the light filtering assembly are distributed along the first optical axis; the light emitting device is used to emit the first light beam; and the light filtering assembly includes a red light filter, a green light filter, a blue light filter and a turntable driving structure; the red light filter, the green light filter and the blue light filter The red filter sheet forms a filter turntable, and the filter turntable is divided into three equal parts. The turntable driving structure is electrically connected to the control unit, and the control unit drives the filter turntable to rotate through the turntable driving structure. In addition, when the filter turntable rotates at least one circle, the red light filter sheet, the green light filter sheet and the blue light filter sheet are sequentially vertically corresponding to the first optical axis, and the first light beam can be sequentially filtered to be one of red light, green light and blue light. The corneal refractive index measurement system as described in claim 1, wherein the ratio of partial reflection and partial transmission of the first dichroic mirror is 50% and 50% respectively. The corneal refractive index measurement system as described in claim 1, wherein the ratio of partial reflection and partial transmission of the second dichroic mirror is 50% and 50% respectively. The corneal refractive index measurement system as described in claim 1, wherein the first auxiliary reflection part is one of a right-angle prism and a plane reflection mirror. The corneal refractive index measurement system as described in claim 1, wherein: the light receiving part includes a photodetector, an amplifier circuit and a filter circuit which are electrically connected in sequence; the photodetector is used to receive the optical signal of at least one of the reflected light beam and the seventh light beam, and output it after converting the optical signal into an electrical signal; the amplifier circuit is used to receive the electrical signal of at least one of the reflected light beam and the seventh light beam output by the photodetector, and output it after amplifying the signal; and the filter circuit is used to receive the electrical signal of at least one of the reflected light beam and the seventh light beam output by the amplifier circuit, and output it after filtering the noise of the electrical signal. The corneal refractive index measuring system as described in claim 1, wherein the measuring area is for a cornea to be measured to be set therein, and the red light reflection value ( R _I ), the green light reflection value ( G _I ), and the blue light reflection value ( B _I ) are all reflection values of the cornea to be measured. The corneal refractive index measurement system as described in claim 1, further comprising: a second auxiliary reflection part, which is disposed on the third optical axis and between the second aperture and the measurement area; the second auxiliary reflection part comprises a transparent disk part, a reflection disk part and a disk driving part; the transparent disk part and the reflection disk part constitute an auxiliary rotating disk, and divide the auxiliary rotating disk into two equal parts; and the disk driving part is electrically connected to the third optical axis. The control unit drives the auxiliary turntable to rotate through the disk driving unit. In addition, when the auxiliary turntable rotates at least one circle, the transparent disk part and the reflective disk part are sequentially and vertically corresponding to the third optical axis; thereby, when the transparent disk part corresponds to the third optical axis, the fourth light beam is allowed to pass through and illuminate the measurement area; and when the reflective disk part corresponds to the third optical axis, it is used to reflect the fourth light beam.