JPH01178236A - Eye refractive power measuring device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides an eye refractive power H1! for measuring the eye refractive power of an eye to be examined.
The present invention relates to a fixed device.

(Prior art) An eye refractive power i11'l determination device for measuring eye refractive power uses a common image receiving element and wavelength selection between the measurement system and the anterior segment observation system using a light splitting material or the like. There are some.

(Problems to be Solved by the Invention) In this conventional method, the wavelengths of the light from the measurement system and the light from the anterior segment observation system are selected using a light splitting material or the like. The wavelength of the light from the anterior eye observation system is changed to prevent the light from the anterior eye observation system from entering the image receiving element during the measurement of eye refractive power, but due to external light etc. If the eye is illuminated and the external light has approximately the same wavelength as the anterior eye illumination light, the anterior eye image will leak into the image receiving element even during i1+11 determination, affecting the 7111I determination. It had the disadvantage of giving away.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and aims to eliminate the influence of external light etc. on the ALL constant.

(Means for Solving the Problems) In order to achieve the above [1], the eye refractive power measuring device according to the present invention cuts the luminous flux of the anterior segment observation system during refractive power measurement, which is harmful to the measurement. Tit the anterior part of the eye to prevent light from entering.
The reason is that a light shielding member is inserted into the thread arrangement.

(Function) In the eye refractive power measuring device according to the present invention, even if there is unexpected illumination such as external light, the light of the anterior segment vA system is reliably blocked by the light shielding member, and the 8III degree is not affected. do not have.

(Example) 1-A. Overall optical apparatus FIG. 1 shows the entire optical arrangement of the eye refractive power measuring apparatus according to the present invention. This eye refractive power measurement device includes an objective refractive power measurement system 1 for objectively measuring the refractive power of the eye E to be examined, and a fixation system for the eye E to fix the visual axis of the eye E during measurement. a synoptic/independent measurement system 2 that projects a visual target for visual inspection and a visual target for subjective testing; It is roughly composed of a part NIQ and an alignment system 3.

FIG. 2(a) is an optical path diagram of the pattern projection system 20 shown in FIG. Wavelength 8 emitted from light emitting diode 200
The refractive power measurement light a of 65 nm is a condenser lens 201
After the light is focused, it is refracted by a conical prism 202 and irradiated onto a ring pattern 203 for measuring refractive power. The light a of the refractor 8111 that has passed through the ring pattern 203 is irradiated onto the ring diaphragm 207 via the relay lens 204, the mirror 2o5 (see FIG. 1), and the relay lens 206. After the refractive power measurement light a passes through the ring diaphragm 207, it is reflected by the reflective surface 208a of the perforated mirror 208. Thereafter, the refractive power fi-t photometry a is reflected by the mirror 209, passes through the half mirrors 112 and 111 as components of the anterior segment observation/alignment system 3, and is transmitted to the fundus ER of the eye E by the objective lens 110. The ring pattern 203 is projected as an image 203' (see FIG. 2).

Here, the light emitting diode 200 and the ring diaphragm 207 are optically conjugate, and the ring diaphragm 207 and the pupil E of the eye E to be examined are located at an optically conjugate position.

B-2=Measurement optical system 21 FIG. 2(b) is an optical path diagram of the measurement optical system 21 shown in FIG. The light of the ring pattern image 203' reflected by the fundus E of the eye E to be examined is focused by the objective lens 110. Then, after passing through the half mirrors 111 and 112, the light is reflected by the mirror 209, and then reflected by the perforated mirror 208.
The light passes through the opening 208b and passes through the aperture 210.

The refractive power measurement light a passes through the aperture 210 and passes through the relay lens 21.
Half mirror 21 that transmits visible light after passing through 1
2 and is irradiated onto an aperture 215 via a relay lens 213 and a mirror 214. As shown in FIG. 3, this diaphragm 215 has a peripheral portion 215b that transmits the refractive power measurement light a having a wavelength of 865 nm, and a central portion 215a that cuts the refractive power measurement light -a.

Moreover, this aperture 215 has a diameter of 400n over its entire area.
It has the property of transmitting visible light of m to 700 nm.

As a result, the refractive power measurement light a is transmitted to the peripheral area 21 of the aperture 215.
A half mirror that passes only through the lens 5b and reflects the visible light through the first focusing lens 216, while transmitting the refractive power measurement light a.
217, it is reflected by the half mirror 117 of the anterior segment observation/alignment system 3, and the ring pattern image 203' (fifth
(see Fig. 6).

The focusing lens 216 and the aperture 215 are part of the pattern projection system 20
The light emitting diode 200, the condenser lens 201, the conical prism 202, and the ring pattern 203 are housed in a movable housing 219, and are movable in the optical axis direction as shown by an arrow 218 in FIG.

In the measurement optical system 21 described above, the diaphragm 210 is optically conjugate with the position of the pupil E of the eye E to be examined with respect to the objective lens 110, and the image receiving element 4 is arranged so that the object VfAE is emmetropic (refractive power ODiopter). Ring pattern 2 when
It is optically conjugate with the intermediate imaging plane A of 03 (see FIG. 2).

t-C, fixation and awareness H side thread 2 Wavelength 400 nm to 700 nm emitted by light source 30
The visible light of m is condensed by a condenser lens 31 and illuminates a chart board 32.

For example, as shown in FIG. 8, the chart board 32 has a sunburst chart (fixation chart) 32a as a fixation target.
, visual acuity chart chart 32b for subjective testing, astigmatism chart 3
2c, a cross-cylinder chart 32d, and a red-green chart 32e are arranged in the circumferential direction, and each chart is rotated about the axis 34 to be selectively inserted into the optical path.

The images of the charts 32a to 32e are projected onto the eye E by the projection lens 35, are reflected by the mirror 36, are reflected by the half mirror 217, and are merged into the measurement optical system 21 of the objective refractive power measurement system 1. It passes through the aperture 215 via the focusing lens 216, and is then connected to the mirror 214 and the relay lens 2.
13 to the half mirror 212.

It passes through the half mirror 212 and is guided to the barrier pull cross cylinder 37. The visible light passes through the barrier pull cross cylinder 37, is reflected by the half mirror 111 via the mirror 38, is projected onto the eye E by the objective lens 110, and the charts 32a to 32e are observed by the eye.

Further, a plurality of glare light sources 33 for emitting visible light for glare testing are arranged near the chart board 32 near the outer periphery of the insertion positions of the charts 32a to 32e inserted into the optical path. This glare test light source 33 can also be placed near the objective lens 110. Also,
In order to perform a glare test, instead of providing the light source 33, for example, a configuration may be adopted in which the contrast between the visual acuity chart and the base of the visual acuity chart 32b is changed.

ID-jYf I-1r (j 651 A plurality of light-emitting diodes 40 for illuminating the anterior ocular segment are arranged outside the objective lens 110 of the difference/alignment system, and red light with a wavelength of 900 nm is emitted from each light-emitting diode 40. External light (hereinafter, this infrared light is given the symbol d) illuminates the anterior segment of the subject's eye E. The infrared light (anterior segment illumination light) d reflected by the anterior segment is reflected by the objective lens. After being focused by 11.0,
The light passes through the half mirror 111, is propagated along the anterior segment observation/alignment system 1 to system 3, and is imaged onto the image receiving element 4 by the imaging lens 118.

Note that a shutter 114 is inserted into the optical path of the anterior eye segment tel rA/alignment system 3 as a shielding member for blocking light from the anterior eye segment observation/alignment system 3 to the image receiving element 4 during measurement. It looks like this. A liquid crystal or the like may be used for this purpose.

A plurality of light emitting diodes 41 that emit infrared light with a wavelength of 900 nm are arranged near the outer periphery of the objective lens 110.

The plurality of light emitting diodes 41 are the alignment light source. The alignment light emitted from the alignment light source 41 (hereinafter, this alignment light will be denoted by the symbol e) is reflected by the eye E to be examined, and then condensed by the objective lens 110, similar to the anterior segment illumination light d. Half mirror 111
After passing through, the light is propagated along the anterior ocular segment a detection/alignment system 3, and is imaged onto the image receiving element 4 by the imaging lens 118. Note that the light emitting diode 40 for illuminating the anterior eye segment may be omitted and one light emitting diode 41 may be used as the light source for illuminating the anterior eye segment.

In front of the half mirror 115 of the anterior segment observation/alignment system 3, an aiming scale projection optical system is arranged. This aiming scale projection optical system includes a light emitting diode 42 that emits red light with a wavelength of 700 nm (hereinafter referred to as scale light), a condensing lens 43 that collects scale light C from the light emitting diode 42, and an aiming scale 44. It is composed of a mirror 45 for reflecting the passed scale light C and making it merge into the anterior eye segment observation/alignment system 3.

The scale light C from the aiming scale 44 is a half mirror.
After passing through 115 , the light passes through the anterior segment observation/alignment system 3 and is imaged onto the image receiving element 4 by the imaging lens 118 .

lyu nirahisa i and engi FIG. 4 is a block circuit diagram of the present optometric apparatus.

The drive circuit 313 receives a command from the arithmetic/control circuit 301, scans the area CCD as the image receiving element 4, and outputs the received image as an analog signal.

The arithmetic/control circuit 301 controls the gate circuit 302, and the gate circuit 302 converts the analog signal from the image receiving element 4 into A/
D converter 303 or display interface 30
output toward 4. The display interface 304 receives an analog signal from the image receiving element 4 via the gate circuit 302 and displays a display 30 such as a CITT, a liquid crystal television, or a plasma display.
5 to display the image received by the image receiver 4.

The A/D converter 303 has a function of converting an analog signal from the image receiving element 4 into a digital signal, and the digital signal is input to the arithmetic control circuit 301.

The arithmetic control circuit 301 is connected to a frame memory 324 that stores data for one screen or several screens of the image receiving element converted into digital signals by the A/D converter 303 . Further, the arithmetic control circuit 301 transmits pulses from the pulse generator 312 to driver circuits 318, 319, 3.
The first memory 3 has the function of selectively supplying the pulses to the first memory 20, counts the number of pulses, and uses the counted value as a signal.
09, and this first memory 309 stores the counted value.

A driver circuit 318 applies pulses from the arithmetic control circuit 301 to a pulse motor 3 for driving the movable cylinder part of the refractive power measurement system 1.
21 to drive this pulse motor 321. The driver circuit 319 is the chart board 3 of the fixation and subjective measurement system 2.
Pulses are supplied to the second rotational pulse motor 322 to drive this pulse motor 322.

The driver circuit 320 supplies pulses to a pulse motor 323 for rotating the VCC 37, and drives the pulse motor 323.

The calculation/control circuit 301 also includes driver circuits 314 to 314.
317, 325 to 327 are connected. The driver circuit 315 supplies power to the light emitting diode 200 of the refractive power measurement system 1 based on a command from the calculation/control circuit 301.

The driver circuit 316 is connected to the anterior eye illumination light source 40 of the anterior eye 11 observation/alignment system 3, the driver circuit 317 is connected to the alignment light source 41, the driver circuit 325 is connected to the aiming scale light source 42, and the driver circuit 327 is connected to the glare light source 33.
, and power is supplied to them based on instructions from the arithmetic/control circuit 301.

Note that the driver circuits 316, 317, and 325 are operated by a common command from the arithmetic and control circuit 301, and the light sources 40.
41 and 42 are configured to turn on and off at the same time. The driver circuit 328 drives the pulse motor 329 in accordance with the lighting and extinguishing of the light emitting diode 200 of the refractive power measurement system 1 based on commands from the arithmetic and control circuit 301. v”
Anterior segment wA inspection/alignment system 3 Heshutter 1
14 is configured to be inserted or removed. Also, is the driver circuit 326 a visual acuity/awareness meter? It is connected to the light source 30 of the 1llll system 2, and supplies power to the light source 30 based on commands from the control circuit 301.

Furthermore, a second memory 310 is connected to the arithmetic control circuit 301 for storing spherical power, cylindrical power, and axial angle based on the measured refractive power. Note that measurements of spherical power, cylindrical power, and axial angle based on refractive power will be described later.

Further, the calculation/control circuit 301 includes a program memory 307 storing calculation/control programs, and a control switch 308 having various switches for starting measurement, selecting a chart at the time of subjective measurement, etc., as shown in FIG. It is connected.

A character circuit 306 that converts the measurement data stored in the memory 310 into characters and numerical values and outputs them to the display interface 304 is also connected to the control circuit 301.

1) The alignment examiner turns on the power switch 30 of the control switch 308.
Turn on 81. Then, the driver circuits 316 and 317 are activated by the arithmetic and control circuit 304, and the light [40,
41, 42, and 30 are lit at the same time. Along with calculations and
The drive circuit 313 is operated by the control circuit 301, and the image receiving probe 4 is thereby scanned. At this time, the arithmetic/control circuit 301 switches the gate circuit 302 so that the analog signal from the image receiving element 4 is sent to the display interface 304. As a result, the anterior segment of the eye E to be examined is illuminated with the light d from the light source 40, the alignment light e from the alignment light source 41 is reflected by the anterior segment, and the light d illuminates the anterior segment. The light e passes through the alignment system 3 and appears on the image receiving element 4 as an anterior segment image.
1'II detection/alignment system 3, and are respectively formed on the image receiving element 4 as an image of the light source 41, which is an alignment index.

On the other hand, the image receiver 4 is illuminated 7 (Q) by the aiming scale light C.
An image of the scale 44 is formed. These three images are converted into analog signals by the image receiving element 4 and output.
The analog signal is sent to the display interface 30.
4 to the display 305. by this,
The display 305 displays images as an anterior segment image [EA, an aiming scale image 44', and an alignment index image 41', as shown in FIGS. 7(a) and 7(b). Note that, instead of the light source 41, a spot projection optical system is provided in which a spot projected image is reflected from the corneal vertex, and the spot projected image is formed on the image receiving element 4. It may also be configured to determine whether or not the alignment is successful depending on whether or not it is within the above predetermined range.

The subject looks at the fixation chart 32a illuminated by the light source 30 using the fixation and subjective measurement system 2, which is partially shared with the refractive power measurement system 1.
This fixes the visual axis of the subject's eye E.

When the alignment index image 41' is outside the aiming scale image 44' as shown in FIG. 7(a), the examiner places the alignment index image 41' (the seventh
The entire optical system of the apparatus is moved up and down and left and right so that the optical axis of the eye E and the optical axis of the objective lens 110 are aligned. Further, the entire optical system of the apparatus is moved back and forth to adjust the working distance to a normal distance so that the anterior segment image EA becomes a clear image.

2) When the dose J4ju ejection tester completes the alignment, he turns on the measurement start switch 3082 of the control switch 308. The calculation/control circuit 301 operates the driver circuit 3 according to the command.
16,317.325 and light source 40.4.
1.42 is turned off for a short period of time. However, the command to the driver circuit 326 continues, and the light source 30 continues to turn on.

The arithmetic/control circuit 301 instructs the driver circuits 314 and 315 to operate during the period when the light sources 40, 41, and 42 are turned off to turn on the light source 200. Hereafter, objective refractive power 111
Until the end of the 11th period, the light rA40, 41, 42 and the lighting of the light source 200 are alternately performed. While the light source 200 is on, an operation command is given to the driver circuit 328 to operate the pulse motor 329, and the shutter 114 is activated to view the anterior segment of the eye. l.Insert into alignment system 3. When the light source 200 is turned off, the shutter 114 is removed from the anterior eye tifl detection/alignment system 3 by operating the pulse motor 329 in response to an operating command from the driver circuit 328 . In addition,
Since the anterior eye segment a icon is not displayed on the display 305 while the light source 200 is on, the display 305 may display, for example, the text "Measuring" at this time. Alternatively, the frame memory 324 may be provided with a memory area for storing the anterior eye image, and the anterior eye image stored in this memory area may be displayed on the display 305 while the light source 200 is on, that is, during measurement. It may also be displayed.

The light emitting diode 200 of the objective refractometer 1111 system 1 emits refractive power measurement light a, and a ring pattern image 200' is projected onto the fundus E of the eye E to be examined.
The fundus reflected light at 0' passes through the measurement optical system 21 to the image receiving element 4.
is projected onto the light receiving surface.

The arithmetic/control circuit 301 switches the gate circuit 302, and the analog signal from the image receiving element 4 is inputted to the A/D converter 303. Thereafter, the arithmetic/control circuit 301 operates the drive circuit 313, the image receiving element 4 is scanned, and its image output, that is, the image output of the refractive power measurement pattern 203'' is A.
/D converter 303. The A/D converter 303 A/D converts the analog signal from the image receiving element 4, and the digital signal is output to the frame memory 324 via the arithmetic/control circuit 301. information is stored.

As shown in FIG. 6, the arithmetic/control circuit 301 scans the memory addresses of the frame memory 324 in predetermined readout scans G1, G2, . . . , G3, . . .
Readout and scan radially according to Gn. This results in
Data corresponding to the image of the pattern 2031 for the refractometer 4111 projected onto the image receiving element 4 is read out and scanned.

If the eye E to be examined is severely farsighted, the refractometer 81! The I pattern image 203'' is projected outside the image receiving element 4. If the eye E is severely myopic, the refractometer 1111 pattern image is projected small near the center.

In both cases, the arithmetic/control circuit 301 outputs a command signal to the driver circuit 318, supplies pulses from the pulse generator 312 to the pulse motor 321, and
19 to control the measurement pattern image 203'' to be projected within a certain range of the light receiving surface.

By this movement of the movable housing section 219, the focusing lens 21
6 is moved, but the same vision chart 32a that is observed by the eye E through the fixation/subjective measurement system 2 becomes a foggy vision state of +1.0 to 2.0 D with respect to the refractive power of the eye E to be examined. It is designed to.

The number of pulses supplied to the pulse motor 321 to move the movable housing section 219 is determined by the calculation/control circuit 30.
1 is counted by a counting circuit, and the counted value is sent to the movable housing part 2.
This is stored in the first memory 309 as a movement amount of 19.

3) The objective control circuit 301 stores data in the frame memory 324 based on the image finally received by the image receiving element 4 after moving the movable housing section 219 based on the above-mentioned previous measurement. As shown in FIG. 6, readout scans G□, G2 .・・・
・,GL,...,G1. ..., Gn is performed and the points 3g□, 1□, ... on the pattern image 203' for refractive power measurement are
Obtain the coordinates of ・, 9g..., 2g,..., 3h.

Pattern image 20 for refractive power measurement obtained by readout scanning
3# point d□, igz,..., ++gt,..., u
Based on the coordinates of ga, ..., *g11, the general formula of the ellipse 203'' at the X, -Y, coordinates is Ax2
+ By" + Cxy = 1 ・=
−(1). From these equations (1) and (2), calculate S-5l, and the refractive power D1 of the strong principal meridian and the refractive power D2 of the weak principal meridian are r, the radius of the pattern image in emmetropia (ODioptρr). In the example shown in FIG. 6, the focal length and X are the base line length (that is, the radius of the conjugate image of the ring diaphragm at the pupil position of the eye to be examined).

Next, the arithmetic/control circuit 301 reads out the amount of movement of the movable housing section 219 stored in the first memory 309, that is, the number of pulses corresponding to the amount of movement of the focusing lens 216, and from this number of pulses, the focusing lens The refractive power correction amount d due to the movement of 216 is calculated by the refractive power D1. In addition to D, (D, +d), (D, +
Find d). As a result, the spherical refractive power S, the cylindrical refractive power C1, and the cylindrical axis angle 0 of the eye to be examined are determined as follows. The arithmetic/control circuit 301 displays the obtained S and C10 on the display 305 via the character circuit 306 and the display interface 304, and also displays them on the second memory 3.
10 to be memorized.

4) Page 7J ill ';! When the examiner next turns on the subjective optometry switch 3083 of the control switch 308, the arithmetic/control circuit 301 stops issuing commands to the driver 314, 315, and thereafter the light source 2
00 stops the light emission. Next, when the examiner selects the visual acuity test chart with the chart selection switch 3089 of the control switch 308, the calculation/control circuit 301 activates the driver circuit 317, and a predetermined number of pulses are sent from the pulse generator 312 to the pulse motor 322. is supplied, the chart board 32 is rotated, and the visual acuity chart 32b (
(see FIG. 8) is inserted into the optical path of the self-awareness meter 81 system 2.

The arithmetic/control circuit 301 calculates the refractive characteristics S, C, 0 of the eye E to be examined stored in the second memory 310, and the refractive characteristics S of the eye E to be examined obtained by determining the objective refractive power Δ1. ,
, C1,0 is read out, the number of pulses required to move the focusing lens 216 based on the value of the spherical refractive power S is calculated, and the obtained number of pulses is sent to the pulse motor via the driver circuit 318. 321, the movable housing section 219 is moved, and the focusing lens 216 is thereby moved.

Next, the calculation/control circuit 301 calculates the number of pulses for rotating the VCC 37 from the cylinder refractive power and the axis angle 0, and the obtained number of pulses is supplied to the pulse motor 323 via the driver circuit 320. VCC37 is rotated. As a result, the subjective measurement system 2 has undergone optical correction according to the refractive power of the eye E determined by the objective refractive power measurement.

The subject is using the visual acuity display chart 3 inserted into the subjective measurement system 2.
Look at 2b and answer the direction of the break in the Landolt ring. The examiner determines the subjective visual acuity of the eye E to be examined from the response of the examiner, and when determining that the corrected visual acuity is insufficient, operates the spherical power correction switch 3088 of the control switch 318. In response to a command from the switch 18, the arithmetic/control circuit 301 supplies pulses from the pulse generator 312 to the pulse motor 321 via the driver circuit 318, and re-moves the focusing lens to a position where corrected visual acuity is improved. The calculation/control circuit 301 counts the number of pulses when the focusing lens is moved again, and calculates d in equation (4) again from this number of pulses.

Based on this new d, 81, C, and 0 are calculated using equation (4), and the calculated values are displayed on the display 305.

When the examiner next selects the astigmatism chart 3085 with the control switch 308, a predetermined number of pulses are supplied to the pulse motor 322 via the driver circuit 319, the chart board 32 is rotated, and the circuit of the subjective measurement system 2 is An astigmatism chart 32c is inserted inside.

Examinee E looks at the inserted astigmatism chart 32c and answers whether or not there are dark lines, and when the examinee responds "Yes," the examiner switches the cylindrical axis correction switch 3090 of the control switch 318. operate.

Based on the command, the arithmetic/control circuit 301 supplies pulses to the pulse motor 323 via the driver circuit 320, rotates the VCC 37, and corrects the cylinder axis.

The calculation/control circuit 301 counts the number of pulses at this time,
Based on the counted value, the cylinder axis angle O is corrected, and the corrected cylinder axis angle is displayed on the display 305.

Next, when the examiner selects the cross cylinder chart 3086 of the control switch 308, the control circuit 301 controls the pulse motor 323 to set the currently set cylinder power C of the VCC 37 as a reference, for example, ±0.5D.
Chart 32 is created by alternating the cylinder axis angle difference of
If there is a difference in appearance, the examiner operates the cylinder power correction switch 3089 of the control switch 308, and the arithmetic/control circuit 301 controls VCC 37 based on the command, The power is corrected and the new cylinder power is displayed on the display 305.

Next, when the examiner selects the red green chart 3087 of the control switch 308, the control circuit 301 operates the pulse motor 322, and the red green chart 32e is inserted into the subjective measurement system 2.

The subject answers how the red-green chart 32e looks, and the examiner operates the spherical power correction switch 3088 of the control switch 308 based on the response.

The calculation/control circuit 301 receives the command and operates the pulse motor 321 to move the focusing lens 216.

The spherical power S is corrected and the new spherical power is displayed on the display 305.

5) Glare Test The examiner then selects glare test 3091 on control switch 308. Then, the arithmetic/control circuit 301 operates the pulse motor 322 via the driver circuit 319, and the chart board 32 is rotated.
2b is inserted into the optical path of the subjective measurement system 2, the driver circuit 327 is activated and the glare light source 33 emits light.

The subject views the visual acuity display chart 32b in the glare of the glare light source. The examiner can know whether or not the eye E to be examined has a mild cataract based on the examinee's response. Note that a known volume or the like may be added to the glare light source so that its brightness can be varied.

(Effects of the Invention) As explained above, according to the present invention, the refractive power meter i1+
Since the light from the anterior ocular segment wt detection and alignment system is blocked during step 11, the eye to be examined is illuminated by external light, etc., and the measurement results are not affected.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the entire optical arrangement of the optometry device according to the present invention, FIG. 2 is an optical path diagram of the objective refractive power measurement system, FIG. 3 is a plan view of the aperture 215, and FIG. 4 is a diagram of the electric circuit. A block diagram showing the configuration, FIG. 5 is a diagram showing the relationship between the image receiving element and the pattern image,
Figure 6 is a schematic diagram for explaining the principle of measuring eye refractive power from a pattern system, Figures 7 (a) and 7 (b) are diagrams showing the display state of the display, and Figure 8 is a subjective measurement. FIG. 9 is a diagram showing an example of a chart for the control switch, and FIG. 9 is a diagram showing the switch arrangement of the control switch. 1... Objective refractive power measurement system, 2... Fixation and conscious needle 8
11 system 3... Anterior segment wt observation and alignment system, 4.
・・Image receiving element Fig. 3 203゛＼ ~++−””′

Claims (1)

[Scope of Claims] In a limiting refractive power measuring device in which the measurement system and the anterior eye observation system share an image receiving element, during the refractive power measurement, the anterior eye An eye refractive power measuring device characterized in that a light shielding member is included in a partial observation system.