JPH1033480A - Optometry apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable optometry apparatus easier for positioning miniaturization. SOLUTION: A light source 13 is to light the ring hole of an alignment mark plate 12 so as to display the alignment mark at the center of a light path 01 of examination sight. Light beam from light sources for a target 14 is projected on the examined eye e through a mirror 11, a light split member 6, a half mirror 7, a mirror 8 and a magnifying lens 9. The light sources for the target 14 are to selectively light up according to its direction in case of the shaft alignment vertical to the light path 01 while all of them light up when the shaft alignment is correctly adjusted. The light varies according to the distance alignment of the light path 01 direction in case of active distance; it becomes brighter when the active distance is correctly adjusted and all the lights become brightest when three directions are correctly adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometric apparatus used in an ophthalmic hospital, an optician, and the like.

[0002]

2. Description of the Related Art Conventionally, as a refractometer for measuring the refractive power and the like of an eye to be examined and an optometry apparatus for measuring a corneal curvature and the like, a stationary type and a handheld type are known.

[0003]

[Problems to be solved by the invention]

(1) However, in the above-described stationary eye examination apparatus of the related art, since the size of an image display means such as a CRT used for displaying alignment three-dimensionally is large, it is necessary to perform measurement while holding the hand. On the other hand, the hand-held optometry apparatus has a problem that it is difficult to adjust the alignment because the direction of the shift is not known during the alignment display.

(2) Since the alignment conditions are not changed for the corneal reflection images of the left and right eyes, the measurement is performed with the pupil decentered. The iris may block light and prevent accurate measurement.

(3) In a device that detects a corneal reflection image and automatically starts measurement, in the case of a patient such as a strabismus or an eccentric pupil, the corneal reflection image cannot be measured at the center of the pupil, and observation is not possible. In the device that observes the eye with the optical system, the configuration of the observation optical system is simplified, but the position of the corneal reflection image cannot be seen. I don't know if I'm measuring.

(4) In the conventional hand-held optometer, since there is no working distance display, it may not be possible to adjust to a proper distance depending on the position of the subject's forehead, and accurate measurement cannot be performed.

(5) When the refractive power is measured, the refraction state of the eye fluctuates with time. Therefore, the measurement is performed a plurality of times and displayed as an average value. Since only the display means is provided, a separate printer is required to print and display the average value and the like.

(6) In the case where the corneal reflection image is detected and the eye to be examined is positioned, sufficient accuracy may not be obtained due to light reflected from the iris and eyelids.

(7) Since the detection optical system that receives the corneal reflection image by the photoelectric sensor and detects the position is formed using a lens, the structure cannot be simplified.

(8) In a device for aligning the subject's eye with liquid crystal, a backlight is used for illuminating the liquid crystal.
A battery-powered device has a problem in that power consumption is large and alignment display is difficult to see when the surroundings are bright.

A first object of the present invention is to provide the above conventional example (1)
An object of the present invention is to provide a small-sized optometry apparatus which can solve the problems of (3) and (3), perform accurate alignment by a simple operation, and perform accurate measurement.

A second object of the present invention is to provide the above-mentioned prior art (2)
An object of the present invention is to provide a hand-held optometry apparatus which can solve the problems of (4), perform proper distance adjustment regardless of individual face differences, and perform accurate measurement at the center of the pupil.

A third object of the present invention is to provide the above-mentioned conventional example (5).
It is therefore an object of the present invention to provide a small and simple optometry apparatus which does not require a printer.

A fourth object of the present invention is to provide the above-mentioned prior art (6)
An object of the present invention is to provide an optometry apparatus which solves the problems of (7) and (7), and accurately detects a corneal reflection image and performs position detection by a corneal reflection image detection optical system having a simple structure.

A fifth object of the present invention is to provide the above-mentioned prior art (8)
It is therefore an object of the present invention to provide an optometry apparatus which solves the above-mentioned problem, enables battery driving with reduced power consumption, and performs accurate alignment with the ambient brightness to which the subject's eye adapts.

[0016]

According to a first aspect of the present invention, there is provided an optometry apparatus for optically observing an eye to be inspected, and a three-dimensionally-positioned eye to be inspected by a corneal reflection image. It is characterized by having detection means for detecting, and display means for three-dimensionally displaying an alignment state by a fixed target based on a signal from the detection means.

An optometric apparatus according to a second aspect of the present invention is an optometric apparatus provided with detecting means for detecting a position based on a corneal reflection image, wherein a measuring means for measuring a refractive power of the eye to be examined and a discrimination for discriminating right and left of the eye to be examined. Means for changing the alignment condition of the detecting means depending on the left and right of the eye to be inspected.

An optometric apparatus according to a third aspect of the present invention includes an observation optical system for optically observing an eye to be inspected, measuring means for measuring the refractive power of the eye to be inspected, detecting means for detecting a corneal reflection image of the eye to be inspected, Display means for displaying the result of the detection means, control means for automatically performing measurement by the measurement means when a predetermined signal is obtained by the detection means, and measurement by the measurement means And a measurement button.

An optometry apparatus according to a fourth aspect of the present invention is characterized in that the optometry apparatus is provided with face contact means which can be freely adjusted back and forth in a contact state, and working distance display means, and performs measurement by hand-held operation.

According to a fifth aspect of the present invention, there is provided an optometric apparatus, comprising: a measuring means for performing optometric measurement; a storage means for storing a plurality of measurement results obtained by the measuring means; and a first display means for displaying the measurement result of the measuring means. And a second display means for switching and displaying a measured value calculated from the plurality of measurement results each time.

An optometric apparatus according to a sixth aspect of the present invention is an optometric apparatus for forming a corneal reflection image by an optical system on a photoelectric sensor to detect the position of an eye to be inspected. A field stop limited to the vicinity is provided in the optical system. An optometric apparatus according to a seventh aspect of the present invention
It is characterized by having positioning detection means for receiving a corneal reflection image to a photoelectric sensor by a lens function of a pinhole or a slit.

An optometric apparatus according to an eighth aspect of the present invention is an optometric apparatus for photoelectrically measuring an eye to be inspected, wherein a liquid crystal for positioning and displaying the eye to be inspected and a diffusing device provided behind the liquid crystal so that external light enters. And a plate.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a plan view of a hand-held refractive power measuring device according to a first embodiment, and FIG. 2 is a side view. A light source sensor unit 2 including an infrared LED light source that emits infrared light obliquely forward and an optical sensor that receives the reflected light is provided at both left and right ends of the housing 1 of the refractive power measurement device on the subject side. Is attached. A face pad 4 that can be adjusted back and forth by a spring 3 is provided at an upper portion of the housing 1, and a measurement switch 5 is provided below the housing 1. Note that the face pad 4 may have a structure in which a knob fitted to a gear is rotated instead of the spring 3 to adjust the front-back position.

A light splitting member 6 that partially reflects visible light is disposed at a position where the eye E to be examined of the housing 1 faces, and is located on an optical path O1 that the subject behind the light splitting member 6 looks far. Has a half mirror 7 disposed therein. A mirror 8 is arranged in the reflection direction on the side of the half mirror 7 in FIG.
The focal length is 70 to 130 mm on the optical path O2 in the reflection direction of
A magnifying lens 9, which is a single lens or a cemented lens, is arranged, and the examiner can look into the eye E through the magnifying lens 9. The magnifying lens 9
If a subject having such a focal length is used, the subject does not mind because the examiner's eye e can be seen in a blurred state.
The examiner can observe the eye E to be sufficiently enlarged.

Half mirror 7, mirror 8, magnifying lens 9
The optical unit 10 is formed by
Is rotatable by 180 degrees around the optical path O1 so that the examiner can always observe with the effective eye. The distance from the optical path O1 to the end on the magnifying lens 9 side of the optical unit 10 is 40 m.
If the distance is set to about m, the subject can see the distant outside with both eyes.

The optical path O2 is set so that the face of the examiner about 50 mm away from the examinee looking in the direction of the optical path O1 cannot be seen.
10 to 15 degrees in the horizontal direction of the line of sight. If the distance between the light splitting member 6 and the mirror 8 is more than 50 mm, it is not always necessary to incline the optical path O2.

In FIG. 2, a mirror 11 is arranged on the optical path O3 in the upward reflection direction of the light splitting member 6, and in FIG. 1, on the optical path O4 in the right incident direction of the mirror 11 as shown in FIG. An alignment mark plate 12 having a ring opening 12a, a red LED alignment mark illumination light source 13 for illuminating the alignment mark plate 12, and a green LED around the alignment mark plate 12.
For example, eight alignment target light sources 14 are arranged.

On the optical path O5 in the downward reflection direction of the light splitting member 6, a lens 15, a half mirror 16, and an alignment detection light source 17 for detecting an eye position of an infrared LED for detecting the eye position are provided. The half mirror 16 is arranged in order at its center, and the alignment detecting light source 17
Is transmitted.

On the optical path O6 in the reflection direction of the half mirror 16, a light splitting member 18 having a reflective surface 18a at the center and six openings around the light splitting member 18 is substantially conjugate with the cornea C of the eye E to be examined. The measurement area array sensor 19 is disposed in the transmission direction of the light splitting member 18. Further, on the optical path O7 in the incident direction of the central reflecting surface of the light splitting member 18,
A dichroic mirror 20, a lens 21, a standard retinal reticle 22, and a light source 23 for measuring refractive power are sequentially arranged, and a point light source 2 for fixation is provided in the incident direction of the dichroic mirror 20.
The light beam from the refractive power measuring light source 23 forms an image on the reflection surface 18a of the light dividing member 18 by the lens 21, and the light dividing member 18 reflects this wavelength light.

FIG. 4 is a diagram showing the configuration of the alignment detection optical system, in which the three-dimensionally refracted optical paths O1, O5, and O6 are drawn in a plane extending manner. On the two optical paths O8 and O8 extending so as to be symmetric with respect to the optical path O1, a common light splitting member 6, field stops 25a and 25b, peripheral portions 16a and 1
The half mirror 16 that reflects the wavelength light of the alignment detection light source 17 by the 6b, the pinhole diaphragms 26a and 26b having a lens function, and the mirrors 27a and 27b are sequentially arranged. The light flux reflected by the mirrors 27a and 27b is Each reaches the area array sensor 19.

The examiner holds the apparatus in front of the eye E with one hand, and the examinee looks far away through the light splitting member 6 and the half mirror 7. The fixation point light source 24 is turned on, and this light beam passes through the optical paths O7, O6, and O5, and passes through the light splitting member 6 into the optical path O1.
The subject is projected on the eye E by thin light from the direction, and the subject looks at the point light source 24 for fixation. The examiner observes the eye E in this state through the magnifying lens 9 from the direction of the optical path O2 and aligns the eye.

FIG. 5 shows an observation field of view seen through the magnifying lens 9, wherein the eye image E ′ to be examined and the alignment mark 12 are shown.
a ′, a target light source image 14 ′ is displayed. Lighting source 1
Reference numeral 3 illuminates the ring opening 12a of the alignment mark plate 12, whereby the alignment mark 12a 'is displayed around the optical path O1 of the observation visual field. The light beam from the target light source 14 is projected to the examiner's eye e via the mirror 11, the light splitting member 6, the half mirror 7, the mirror 8, and the magnifying lens 9.

The target light source 14 selectively turns on the axis alignment display in the direction perpendicular to the optical path O1 depending on the direction. In the working distance display, the brightness changes depending on the distance alignment in the optical path O1 direction. When the working distance is matched, the light is turned on brightest, and when the working distance is matched, all lights are turned on brightest. That is, the target light source 14 is not turned on at least when the axis alignment or the distance alignment deviates by a certain amount or more.

The examiner applies the forehead rest 4 to the subject's forehead and adjusts the working distance while observing the brightness of the optotype light source 14.
In addition, it may be made to blink when the distance is right, and a two-color LED is used to display so that the front and back can be seen.
, The front and rear may be displayed in different colors, and when alignment is achieved, the two colors may be displayed.

The luminous flux from the alignment detecting light source 17 is projected onto the eye E from the direction of the optical path O1 via the half mirror 16, the lens 15, and the light dividing member 6, and a corneal reflection image 17 'is formed on the cornea C. Is done. This corneal reflection image 17 '
Are two directions symmetrical to the optical path O1, the light dividing member 6, the field stop 2
5a, 25b, the peripheral portion 16a of the half mirror 16, the pinhole apertures 26a, 26b, the mirrors 27a, 27b, and the light is received by the area array sensor 19. At this time,
The light reflected by the cornea C and returning on the optical paths O1, O5, O6 passes through the light splitting member 6, the lens 15, is attenuated by the half mirror 16, and is shielded by the light splitting member 18.

Since the field to be measured is limited within the reflected light beam of about 2 mm at the center of the cornea C by the field stops 25a and 25b, light incident from outside does not reflect at the center of the cornea C. Further, since there is no iris in the measured area, harmful light that hinders detection can be accurately detected without being incident on the area array sensor 19. As described above, if the area to be measured is limited within the pupil, the light receiving sensor may not be used for refractive power measurement, and a four-division sensor or a position sensor may be used for detection in each optical path. Good.

Since the corneal reflected light 17 'has a sufficiently high light intensity, it can be detected even if the pinhole apertures 26a and 26b are small, and a slit may be used instead of the pinhole apertures 26a and 26b. In any case, since a lens is not required, the structure of the apparatus can be simplified.

The area array sensor 19 shown in FIG.
On the top, a corneal reflected light beam 17 ′ from the alignment detection light source 17 and a fundus reflected light beam 2 from the refractive power measurement light source 23 are displayed.
3 'are drawn together, but actually both light sources 1
7, 23 are not turned on at the same time.

The two corneal reflected lights 17 'by the alignment detecting light source 17 change their distances if the distance alignment in the optical path O1 direction changes, and if the axial alignment of the eye E is not aligned, their positions are centered. Deviate. Therefore, the signal of the area array sensor 19 is fetched into a built-in memory, the positions of the two reflected lights 17 'are calculated by a computer, and the signals are used to control the turning on and off of the target light source 14, and When it comes to alignment,
Alignment detection is completed and alignment detection light source 1
7 is turned off, and the refractive power measurement light source 23 is automatically turned on to measure the refractive power.

The light source sensor 2 emits a light beam obliquely forward and receives reflected light, as indicated by the arrow shown in FIG. Since a stronger signal is obtained by the optical sensor that receives the reflected light from the central part of the face, the left and right eyes of the eye E to be examined are thereby determined. Note that the left / right determination may be made based on whether only one side has a predetermined strength. Note that the left / right identification signal from the light source sensor unit 2 can be used not only for displaying with the measured value but also for alignment detection display.

The luminous flux of the alignment detecting light source 17 is projected from the line of sight of the eye E to be examined.
Since 7 ′ is generated on the nose side by 0.3 to 0.5 mm from the pupil center, the position of the left corneal reflected light 17 ′ is
When the optical axis deviates from the center of the optical axis by about 0.4 mm in each direction, it is displayed that the axis alignment is correct, and the automatic measurement is performed. Therefore, if it is known which of the left and right eyes is being measured, it becomes possible to reliably measure the refractive power using the light beam passing through the center of the pupil.

In the case of a stationary refractive power measuring device,
As the left and right eye discriminating means, a conventional method of detecting the position of the slide table with a microswitch may be used.
When the alignment is detected by 7 'and the measurement is performed automatically, by changing the conditions for automatic measurement with the left and right eyes,
Accurate measurement is possible even when the pupil is small.

The light beam from the refractive power measuring light source 23 passes through the stop 22, the lens 21, and the dichroic mirror 20, and
The light is reflected by the reflection surface 18a of the light splitting member 18 and the half mirror 16, and is projected onto the fundus of the eye E through the lens 15 and the light splitting member 6. The reflected light from the fundus returns along the same optical path, passes through the six apertures of the light splitting member 18, is received as six light fluxes by the area array sensor 19, and the position thereof is calculated by a computer to measure the refraction value.

The refractive power measurement is automatically performed based on the alignment signal, but can also be performed by pressing the measurement switch 5. With a strabismic eye, a baby or an eye during surgery, it is difficult to expect that the line of sight is always directed to the optical path O1, and it is difficult to detect the alignment by the corneal reflected light 17 ', so that some of the target light sources 14 are turned on. When the distance is approximately the same, looking at the brightness, the measurement switch 5 is pressed to perform measurement. Also, by looking at the alignment mark 12a ', the pupil and the alignment target image 14' through the observation optical system, it is possible to determine whether or not the line of sight is in the optical path O1 direction. If the measurement is performed by pressing the switch 5, the measurement can be performed at any time regardless of the viewing direction.

The refractive power measurement is performed at a repetition rate of several Hz. If the six measurement light beams 23 ′ from the measurement light source 23 on the area array sensor 19 have brightness equal to or higher than a predetermined value and are uniform, alignment is achieved. The measured light flux position is calculated and stored as a measured value, and the fact that the measurement has been performed is displayed by sound or the like. If not, the process proceeds to the next measurement without calculating the measured value. Then, after about ten measurement results are obtained, an indication of the end of the measurement is displayed.

FIG. 7 shows a display means comprising a reflective liquid crystal display panel 28 provided on the housing 1 of a small refraction measuring device. On the reflection type liquid crystal display panel 28, a number display N, a spherical degree S, a cylindrical degree C, an astigmatism angle A, right and left eyes R and L are displayed, and each time a measurement is performed, each measurement is performed. The values are displayed one after another, and when the button 29 is pressed, the average value calculated from the stored measurement values is displayed, so that the next optometry can be performed by looking at this value without printing.
Note that the average value may be displayed as a recommended value calculated excluding a value with low reliability.

Next, in the case of the modified example in which the optical unit 10 of the first embodiment is not provided, the examiner passes through the light splitting member 6 slightly from the side so as not to obstruct the examinee from looking forward with both eyes. Look at optometry E. Since the eight alignment optotype images 14 'are not enlarged, it is easy to see if the diameter is set to about 20 mm. The alignment mark 12a 'is set to the size of the measurement light beam, and the alignment mark 12a'
a 'is roughly adjusted, and when the target light source 14 is turned on, the alignment target image 14' is viewed and matched. The optotype light source 14 may be provided on the case 1 on the subject side near the light dividing member 6.

FIG. 8 is a diagram showing the configuration of an optical system of a hand-held corneal curvature measuring apparatus according to the second embodiment. A light splitting member which becomes a half mirror with visible light is provided on an optical path O9 facing the eye E to be examined. 3
0 and the lens 31 are arranged, and the optical path O9 reaches the examiner's eye e. Further, four sets of illumination light sources 32 and lenses 33 are provided on the upper, lower, left, and right sides around the optical path O9 near the light splitting member 30. Optical path in the upward reflection direction of the light splitting member 30
A transmission type TN liquid crystal display panel 34 separated into a plurality of cells is disposed on O10, and a diffusion plate 36
A lens 37, a diaphragm 38, and an area array sensor 39 are sequentially arranged on an optical path O11 in the downward reflection direction of the light splitting member 30.

The corneal reflection image 32 ′ on the cornea C by the four illumination light sources 32 passes through the light splitting member 30, the lens 37, and the stop 38 as shown in FIG.
The corneal curvature is measured by receiving light at four places on the surface 9 and calculating the positions of these corneal reflection images 32 'by a computer. In addition, distance alignment is determined from the degree of blur of the corneal reflection image 32 ', axis alignment is determined from the entire position of the corneal reflection image 32', and measurement is automatically performed when alignment is achieved, and the result is displayed on a liquid crystal display. Displayed on the plate 34.

As shown in FIG. 10, the axial alignment is performed by a circumferential cell 34 composed of eight segments of the liquid crystal display panel 34.
a, and the distance alignment is performed by the center cell 34b. Circumferential cell 34a is partially transmissive to indicate axis alignment, appears circular when the axes are aligned, and central cell 34b is transparent and bright when distance aligned. Since the alignment mark cell 34c of the liquid crystal display panel 34 indicating the center of the optical path O9 always looks bright, the eye E to be examined is first aligned with the alignment mark cell 34c, and then the cells 34a and 34b are accurately aligned when the cells 34a and 34b are turned on. .

Since the transmissive TN type liquid crystal display panel 34 is always brightly illuminated by the light collected from above the casing 35 through the diffusion plate 36, no backlight is required and the power consumption is small. In addition, since the examiner is illuminated with the same room light, the examiner superimposes the cells 34a and 34b on the subject's eye image E via the light splitting member 30 and the magnifying lens 31 with a brightness corresponding to the brightness of the subject's eye E. And the cell 34c of the alignment mark can be seen.

[0052]

As described above, the optometry apparatus according to the first aspect of the present invention detects the position of the eye to be examined three-dimensionally by corneal reflected light, and displays three-dimensional alignment with a fixed target based on this signal. In addition, the size of the apparatus can be reduced and the alignment can be facilitated.

The optometry apparatus according to the second aspect of the invention can accurately measure the center of the pupil by judging the left and right of the eye to be inspected and changing the alignment condition of the detecting means by the left and right eyes.

The optometry apparatus according to the third aspect of the present invention controls the automatic measurement when a predetermined signal is obtained by the detection means, thereby enabling downsizing, accurate alignment, and accurate measurement.

The optometry apparatus according to the fourth aspect of the present invention is provided with face contact means and working distance display means which can be adjusted back and forth in contact with each other, so that proper distance adjustment can be carried out in a hand-held manner without depending on individual face differences. it can.

The optometry apparatus according to the fifth aspect of the present invention can have a small and simple structure that does not require a printer by switching and displaying the measured values calculated from the results of the plurality of measurements each time. .

The optometry apparatus according to the sixth aspect of the present invention can accurately detect the position of the corneal reflection image by limiting the detection area of the corneal reflection light to the vicinity of the corneal reflection image by the field stop.

The optometry apparatus according to the seventh aspect of the present invention can form a corneal reflection detection optical system having a simple structure by receiving the corneal reflected light and detecting the alignment by the lens function of a pinhole or a slit.

The optometry apparatus according to the eighth aspect of the present invention illuminates the liquid crystal for displaying the alignment of the eye to be inspected with external light from behind via a diffusion plate, thereby reducing power consumption. And accurate positioning based on the natural brightness of the surroundings.

[Brief description of the drawings]

FIG. 1 is a plan view of a handheld refractometer according to a first embodiment.

FIG. 2 is a side view.

FIG. 3 is a plan view of a target light source and an alignment mark plate.

FIG. 4 is a configuration diagram of a corneal reflection image detection optical system.

FIG. 5 is an explanatory diagram of an observation visual field by a liquid crystal display panel.

FIG. 6 is an explanatory diagram of a refractive power measurement light beam and a corneal reflection image light beam on the area array sensor.

FIG. 7 is an explanatory diagram of a measurement result display means.

FIG. 8 is a side view of an optical system of a hand-held corneal curvature measurement device according to a second embodiment.

FIG. 9 is an explanatory diagram of a measured corneal reflection image light beam on the area array sensor.

FIG. 10 is an explanatory diagram of a liquid crystal display panel.

[Explanation of symbols]

 1, 35 housing 2 light source sensor unit 4 face contact 6, 7, 16, 18, 20, 30 light splitting member 12 alignment mark plate 13, 14, 17, 23, 24, 32 light source 19, 39 area array sensor 22, 25, 26, 38 Aperture 28, 34 Liquid crystal display panel 36 Diffusion plate

Claims (13)

[Claims] 1. An observation optical system for optically observing an eye to be inspected, a detecting means for three-dimensionally detecting the position of the eye to be inspected by a corneal reflection image, and a three-dimensional fixed target based on a signal from the detecting means. An optometry apparatus comprising: a display unit for displaying an alignment state. 2. The optometry apparatus according to claim 1, wherein the fixed optotype is displayed by being superimposed on an eye to be examined by the observation optical system. 3. The fixed target is a plurality of targets arranged on a circumference, and the plurality of targets are partially lit according to an alignment direction, and all are lit when alignment is achieved. The optometry apparatus according to claim 1. 4. The optometry apparatus according to claim 1, wherein the distance alignment is displayed by changing brightness or color. 5. An optometric apparatus provided with a detecting means for detecting an alignment based on a corneal reflection image, a measuring means for measuring a refractive power of the eye to be inspected, a determining means for determining left and right of the eye to be inspected, and a left and right of the eye to be inspected. And a changing unit for changing the alignment condition of the detecting unit. 6. An observation optical system for optically observing an eye to be inspected, a measuring means for measuring a refractive power of the eye to be inspected, a detecting means for detecting a corneal reflection image of the eye to be inspected, and a result of the detecting means being displayed. Display means, a control means for automatically controlling the measurement means when a predetermined signal is obtained by the detection means, and a measurement button for measuring the measurement means. An optometric apparatus characterized by the above-mentioned. 7. An optometric apparatus comprising: a face contacting means which can be freely adjusted back and forth in a contact state; and a working distance display means, wherein measurement is performed by hand-held operation. 8. A measuring means for performing an optometric measurement, a storage means for storing a plurality of measurement results by the measuring means, a first display means for displaying a measurement result of the measuring means, and the plurality of measurements. An optometry apparatus comprising: a second display unit that switches and displays a measurement value calculated from a result each time. 9. An optometry apparatus which forms a corneal reflection image by an optical system on a photoelectric sensor to detect a position of an eye to be inspected,
An optometry apparatus, wherein a field stop for limiting a detection area for detecting a corneal reflection image to a vicinity of the corneal reflection image is provided in the optical system. 10. The optometry apparatus according to claim 9, wherein the corneal reflection image is formed at the center of a pupil. 11. An optometry apparatus comprising: a position detecting unit for receiving a corneal reflection image to a photoelectric sensor by a lens function of a pinhole or a slit. 12. An optometric apparatus for photoelectrically measuring an eye to be inspected, comprising: a liquid crystal for displaying the position of the eye to be inspected; and a diffusion plate provided behind the liquid crystal so that external light enters. Optometry device. 13. The optometry apparatus according to claim 12, wherein the diffusion plate receives external light from above.