JPH06197868A - Eye refraction meter - Google Patents

Abstract

PURPOSE:To precisely measure a refractive power by removing the necessity of intervention of adjustment. CONSTITUTION:Lenses 6R, 6L, dichroic mirrors 7R, 7L, movable lenses 8R, 8L and targets 9R, 9L are successively arranged on the visual axes 01R, 02R in front of eyes ER, EL to be examined, symmetric with each other, and optical paths 02R, 02L in directions of reflection of the dichroic mirror 7R, 7L crosses together on a changeover mirror 11, and a refraction measuring means in the direction of reflection of the dichroic mirror 12. Upon measurement, the changeover mirror is turned onto the optical path 02L, and the targets 9R, 9L are set onto the eyes EL, ER to be examined, respectively. At this time, the movable lenses 8L, 8R are moved so as to relieve the refractive power of one of the eyes while blurring the refraction of the other one of the eyes, and thereafter, the refractive power is measured with the use of the refraction measuring means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eye refractometer widely used in ophthalmology clinics and the like.

[0002]

2. Description of the Related Art Conventional eye refractometers generally use so-called monocular vision in which a fixation target is presented only to the eye to be measured when measuring the eye refraction.

[0003]

However, in the above-mentioned conventional example, since the fixation target is not presented to the other eye,
The effect of accommodation by the other eye may interfere with the accommodation of the eye to be examined, resulting in a state called so-called mechanical myopia, and an error may occur in the refraction measurement value of the eye to be examined.

An object of the present invention is to provide an eye refractometer capable of solving the above-mentioned drawbacks, eliminating the effect of intervention of the other eye on accommodation of the eye to be examined, and reliably guiding the eye to be examined to the far point. Especially.

[0005]

A first eye refractometer according to the present invention for achieving the above object comprises an eye refraction measurement system adjustably arranged at the positions of the left and right eyes, and a fixed lens refraction measurement. It is characterized by comprising a system and a light guiding means for guiding a light beam from the lens refraction measurement system to the eye refraction measurement system.

The second eye refractometer includes a corneal curvature measuring light source provided around the optical axis, a binocular optotype system whose one side is adjustable in the interpupillary direction, and a light splitting member provided on the optotype system. And a switching unit for sequentially guiding the left and right eye refraction measuring light and the corneal curvature measuring light to the photoelectric detecting unit.

The third eye refractometer is a fixation target for both eyes,
An eye refraction measurement system that sequentially measures refraction of the left and right eyes, and a control means for determining the diopter of the optotype of the other eye according to the refraction value measured by the eye refraction measurement system of the eye to be examined, To do.

The fourth ocular refractometer has a diopter guide target capable of changing diopter separately for both eyes, an eye refraction measuring system for objectively refracting the right and left eyes sequentially, and the other eye is fixed. It is characterized in that a diopter is guided by the diopter guide while the target is being shown, and refraction of the eye to be examined is measured by the eye refraction measuring system.

The fifth eye refractometer includes an optotype system capable of adjusting the positions of both eyes, an objective eye refraction measuring system, and lens measuring means.
And an optical path coupling means for guiding the measuring light by the lens measuring means to the eye refraction measuring optical path.

The sixth eye refractometer includes a left and right eye optotype system having diopter varying means, an optical path coupling member provided between the diopter varying means and the eye to be examined, and the left and right eye optotype systems. And objective refraction measuring means that can be switched or moved between them.

The seventh eye refractometer has a standard system, an anterior segment observation system, an objective eye refraction measurement system, and means for selectively presenting a target to only one eye. To do.

[0012]

The first eye refractometer having the above-described structure adjusts the eye refraction measurement system to the left and right eye positions, guides the measurement light beam in the lens refraction measurement system to the measurement section of the fixed eye refraction measurement system, and Lens refraction value is measured.

The second eye refractometer guides the measurement light beam to the photoelectric detection means through the switching means to measure the eye to be measured during the corneal curvature measurement and the refraction measurement, and then switches the switching means to measure the other eye. The other eye measurement is performed by guiding the light flux to the photoelectric detection means.

The third eye refractometer measures the eye refraction by the eye refraction measuring system while presenting independent fixation targets for the left and right eyes, and changes the optotype diopter of the other eye according to the measured value.

The fourth ocular refractometer, when measuring the eye to be inspected, presents it to the eye to be inspected while fixing the diopter guidance target presented to the other eye, and conducts eye refraction while inducing the diopter of the eye to be inspected. Take a measurement.

The fifth eye refractometer guides the light beam to the objective eye refraction measuring means via the optical path coupling means at the time of lens measurement, and measures the lens refraction degree.

The sixth ocular refractometer performs left and right eye refraction measurement by alternately switching or moving the objective refraction measurement system between the left and right eye optotype systems.

The seventh eye refractometer selectively presents the optotype to only one eye during the eye refraction measurement.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a plan view of an eye refractometer in the first embodiment,
2 is a side view and FIG. 3 is a front view. The first embodiment is an apparatus in which the functions of a refractometer, a keratometer, and a lens meter are combined, and the measurement bed 1 placed on a slide table (not shown) has a function as shown in FIG. In addition, an eye measurement optical table 3 that rotates around the rotation center axis 2 is provided. A fixed right eye target system 4 is arranged on the right side above the eye measurement optical table 3, and a left eye target system 5 movable in the direction of the interpupillary distance B.
Is arranged on the left side. Optical axis 01 in front of eye ER, EL
Lenses 6R and 6L, dichroic mirrors 7R and 7L, movable lenses 8R and 8L movable in the optical axis direction, and targets 9R and 9L are symmetrically arranged on R and 01L, respectively. Light sources 10R and 10L for measuring corneal curvature are provided at four locations on the left and right, respectively.

The optical paths 02R and 02L, which are the reflection directions of the dichroic mirror 7R and the dichroic mirror 7L, intersect each other on the rotating switching mirror 11 and the optical path upward on the optical path 03 reflected by the switching mirror 11. Movable mirror 1 for switching a dichroic mirror 12 for splitting, a light flux from the lens meter optical path 04, and a light flux from the optical path 03 direction.
3, a lens 14, a diaphragm 15 having an opening at the center, and an area image sensor 16 are sequentially arranged, and the output of the area image sensor 16 is connected to a control means such as a computer (not shown). Also, the dichroic mirror 12
A refraction measuring unit 17 including an infrared light source, a photoelectric sensor, an infrared TV camera, and the like (not shown) is provided in the reflection direction.

An optical path 04 below the movable mirror 13 is an optical path for a lens meter provided in the measuring bed 1. The optical path 04 is from the movable mirror 13 side to the mirror 18 and the lens 1
9, a lens 20, a mirror 21, a lens L to be inspected such as wearing glasses, and a light source 22 are sequentially arranged. Mirror 1
8, lens 19, lens 20, mirror 21, light source 22
Is provided on the measurement bed 1 independently of the eye measurement optical table 3.

Alignment is performed prior to measurement. An examinee is seated in front of the device, and an infrared television camera provided in the refraction measuring means 17 is used to set the center of the pupil of the right eye ER and the optical axis.
Slide the slide so that 01R matches. Next, the switching mirror 11 is switched while the eye measurement optical table 3 is kept horizontal with respect to the measurement bed 1, and the left eye fixation target system 5 is moved in the interpupillary direction B while observing the left eye with the infrared television camera. Slide to and adjust the interpupillary distance.

In general, since the left and right eyes have different heights, this state is equivalent to the state in which the upper and lower prisms are included depending on the diopter, and the state is diplopia, and both eyes fixate the target. It is impossible to do. For this reason, the eye measurement optical table 3 is rotated around the rotation center axis 2 and the optical axes 01R and 01
Adjust L so that both L and left eye EL and ER coincide with the pupil center. If the alignment matching position is set to the single focal point position of the lenses 6R and 6L, the pupil position imaging light flux becomes a parallel light flux in the optical system after the lenses 6R and 6L, so that the left eye optotype system 5 slides and does not show in the figure. The image displayed on the eye observation television does not change in focus state and magnification. In addition, the focus does not change in the measurement with the keratometer.

In the eye refraction measurement, first, the right eye ER is measured. That is, the movable lenses 8R and 8L and the visual targets 9R and 9L are set in a state of being viewed at infinity, and eye refraction measurement is performed. The infrared light flux emitted from a light source (not shown) inside the refraction measuring means 17 is a dichroic mirror 12 and a switching mirror 1.
1. The light enters the right eye ER to be inspected through the dichroic mirror 7R and the lens 6R. The fundus reflected light returns through the same path, is received by a photoelectric sensor (not shown) provided in the refraction measuring means 17, and the refracting power is calculated from the state of the received light beam.

In this state, almost correct eye refractive power is calculated, but since remission may not be sufficient, clouding is further applied to perform measurement. The left and right eyes EL and ER often have the same diopter, and it is common that the remission of accommodation power due to fog is about the same, so the other eye is about 1 to 1.5D more than the measured eye. , Adjust the movable lenses 8R and 8L so as to add extra cloud and move them in conjunction.

The cloud measurement is performed several times, and when the measured value is stable, the left eye EL is measured. The switching mirror 11 is switched to bring the left eye EL into a measurement state, and the right eye ER side has a movable lens 8R so that the measured diopter value is 1 to 1.5 D on the far vision side with respect to the measured right eye refraction value. Adjust. The target of the right eye ER is fixed in this state, and the fog state of the left eye EL is changed several times to induce adjustment remission and refraction measurement is performed. When the measurement is started from the left eye EL, the implementation method may be reversed. Also,
For a subject who inevitably experiences diplopia with binocular vision, the other-eye optotype is turned off for measurement.

When measuring the corneal curvature by the keratometer, first, the four light sources 10R on the right eye ER side, which is the measurement eye, are measured.
Lights up. The cornea reflected light reaches the switching mirror 11 via the lens 6R and the dichroic mirror 7R. The light flux is reflected by the switching mirror 11, and a cornea reflection image is formed on the area image sensor 16 via the dichroic mirror 12, the lens 14, and the diaphragm 15. At this time, the movable mirror 13 is assumed to be retracted outside the optical path as shown by the dotted line in FIG. The corneal reflection image formed on the area image sensor 16 is subjected to image processing by a computer to obtain the corneal curvature radius. The corneal curvature of the left eye EL is similarly calculated when the switching mirror 11 is switched.

When using the lens meter, the examiner places the lens L to be inspected at a predetermined position and presses the measurement switch. The light source 22 is turned on, and the light flux that has passed through the lens L to be tested passes through the optical path 04, is reflected by the movable mirror 13 that has moved upward, and forms an image on the area image sensor 16 through the lens 14 and the diaphragm 15. The light source image on the area image sensor 16 is unfolded by a computer (not shown), and the power of the lens L to be tested is calculated.

When the subject wears spectacles,
First, measure the diopter power of the spectacles, and make sure to remove the accommodation of the eye by measuring the dioptric power by applying a cloud about 1 to 1.5D away from the measured diopter power of the spectacles. be able to. These visual diopter settings are
All should be done automatically by the computer.

The eye measurement optical table 3 may be driven by an electric system or manually. Also, optical axis 01R
, 01L, the eye measurement optical table 3 is tilted in order to match the visual axis, but this tilting operation causes an error in the axis angle measured by the corneal curvature measurement and the lens meter measurement. However, since this error is slight, it may be ignored, or it may be corrected by a computer by providing a mechanism for measuring the tilt angle of the eye measurement optical table 3.

When measuring with a lens meter,
Since there is no need for the eye measurement optical table 3 to be inclined, it is possible to return the eye measurement optical table 3 to the horizontal state before performing the measurement.

Further, when measuring the corneal curvature, the optical path is deviated due to the inclination of the eye measurement optical table 3, and the diaphragm 1
The effect in item 5 may be slightly affected by the eye gap value, but it is not a problem. The diaphragm 15 may be inserted as an actual diaphragm having an opening at the time of measuring the corneal curvature, or may be composed of a dichroic mirror or the like that selectively blocks the wavelength of the light beam used for measuring the corneal curvature in an annular shape. There is no.

FIG. 4 is a plan view of the second embodiment, and FIG. 5 is a front view. As in the first embodiment, the optical path 05R is attached from the right side to the upper part of the table 27 which is mounted on a table provided with a sliding mechanism capable of three-dimensional alignment and tilts up and down about the rotation center axis 26. , 06, 05L are provided in parallel.
On the optical paths 05R, 06, 05L, a right eye target system 28R movable with respect to the base 27, an objective refraction measuring means 29 fixed to the base 27, and a left eye target system movable with respect to the base 27, respectively. 28L is provided, and the right eye optotype system 28R and the left eye optotype system 28L
Are connected to interlocking mechanisms 30R and 30L, respectively, and are moved by a desired distance in the interpupillary direction by rotation of a step motor 31 connected to the interlocking mechanisms 30R and 30L. In addition, the right eye target system 28R and the left eye target system 28
L is always located equidistant from the objective refraction measuring means 29.

A lens 32 is attached to the right eye optotype system 28R from the front.
R, a lens 33R movable in the optical axis direction, and an optotype 34R are provided, and a dichroic mirror 35 that divides the optical path 05L from the front to the lens 32L above the left eye optotype system 28L, a lens 33L movable in the optical axis direction, The optotypes 34R are sequentially provided. As shown in FIG. 5, a lens 36 and a two-dimensional CCD 37 are provided in the reflection direction of the dichroic mirror 35, and are used for alignment of the interpupillary distance and inclination. In front of the optical path 06, the lens 38, the dichroic mirror 39, the movable lens 40 movable in the optical axis direction, and the visual target 41.
Are sequentially arranged, and above the dichroic mirror 39, the objective refraction measuring means 29 and the housing part 42 of the anterior ocular segment observing television camera shown in FIG. 5 are arranged.

In order to measure the refraction of the right eye ER, the subject first positions the right eye ER in front of the optical path 06, and the left eye EL is placed in the optical path 05L.
Sit to be in front of. The examiner uses a sliding mechanism (not shown) to move the device three-dimensionally and performs alignment so that the optical path 06 is accurately positioned in front of the right eye ER.

FIG. 6 is an explanatory view of an image on the television monitor 43 imaged by the anterior segment observation television provided in the storage section 42. A mark M1 that matches the anterior ocular segment image and the optical path 06 position is displayed on the television monitor 43, and alignment is performed so that the mark M1 matches the pupil Ep position of the right eye ER. Two-dimensional C provided on the left eye target system 28L
The image of the left eye EL is displayed on the CD 37. The left eye image is analyzed by a computer, and the pupil position of the left eye EL is detected. The detected pupil position is displayed on the television monitor 43 as a mark M2. Mark M2 is the pupil of the examiner
The pupil distance and the inclination of the base 27 are adjusted so as to match Ep.

When the alignment is completed, the examiner measures the right eye ER as in the first embodiment. When the measurement of the right eye ER is completed, slide the entire device laterally so that the left eye EL is positioned in front of the optical path 06 and the left eye EL is measured so that the right eye ER is positioned on the optical path 05R. . Interlocking mechanism 30
R and 30L are used for the right eye target system 28R and the left eye target system 28
Since L is moved in the direction of the pupil width at the same time, and further, the distance from the optical path 06 is equal, the entire device is laterally slid to measure the left eye ER so that the pupil Ep of the left eye ER and the mark M1. If the alignment is performed so as to match, the measurement can be performed without adjusting the right eye optotype system 28R, and the operation can be simplified. Note that the alignment operation such as the interpupillary adjustment operation and the tilting operation of the base 27 may be automatically performed by computer control.

FIG. 7 is a plan view of the third embodiment, FIG. 8 is a side view, and FIG. 9 is a front view. As shown in FIG. 9, on a base 51 provided with face fixing means such as a chin rest (not shown), a measurement bed 52, which is slidable from side to side with a roller or the like attached to the bottom, is placed. There is. Inside the measurement bed 52, various measurement units are mounted on the upper surface, and on the lower surface, a table 56 tilted vertically by a motor 55 provided at the other end about a shaft 54 penetrating the bearing 53. Is provided. On the upper part of the table 56, a right eye optotype system 57R fixed to the table 56 and two guides 58 provided in front and rear.
A left eye optotype system 57L mounted slidably in the interpupillary direction manually or electrically along the is provided in parallel with the right eye optotype system 57R. A table 5 is provided above the optotypes 57R and 57L.
6 of these two optotype systems 57R, 57
Two U-shaped guides 59 horizontally extending above L are installed in parallel in a direction parallel to the subject.

Further, on the upper part of the guide 59, the refraction measuring means 6 which moves electrically or manually on the visual target systems 57R and 57L.
0 is placed, the guide 59 supports the refraction measuring means 60, and serves as a guide when the refraction measuring means 60 slides in the lateral direction. From the right eye ER side to the right eye target system 57R,
Objective lens 61R, dichroic mirror 62R that splits the optical path upward, lens 63R, optotype 64R that is movable in the optical path direction and whose position is controlled by a computer
Is provided.

Further, the left eye optotype 57L includes an objective lens 61L from the left eye EL side, a dichroic mirror 62L for splitting the optical path upward, a dichroic mirror 65 for splitting the optical path to the side, a lens 63L, movable in the optical path direction. Naive target 64
L is provided, a lens 66 is provided in the reflection direction of the dichroic mirror 65, and an image pickup means 67 for picking up an image of the anterior segment of the left eye EL.
Is provided. Further, inside the refraction measuring means 60, a dichroic mirror 68 on which the light beams from the lower dichroic mirrors 62R and 62L are incident and a television camera 69 for imaging the anterior segment are provided, and the dichroic mirror 68 is arranged in the reflection direction. A refraction measuring unit 70 including a light source, an imaging system, and the like is arranged.

At the time of alignment, the refraction measuring means 60 is placed on the right eye target system 57R and the dichroic mirror 6 is used.
The optical axis of 2R and the optical axis of the refraction measuring means 60 are aligned. In this state, the subject sits in front of the apparatus and fixes his or her face on a face pad (not shown). The examiner moves the measurement bed 52 while observing the right-eye image captured by the television camera 69 and displayed on the television monitor 71 shown in FIG. 10, and the right-eye pupil Ep and the annular alignment mark M3 become concentric circles. To adjust.

Next, the left eye EL is aligned. In the left eye target system 57L, the left eye image is captured by the image capturing means 67 as shown in FIG. The computer analyzes the scanning line S on the left eye image and calculates the position of the left eye EL. The calculated left eye position is displayed on the television monitor 71 as an alignment mark M4 which is separated by a distance corresponding to the amount of deviation from the alignment matching position. The examiner is the left eye optotype 5
The left eye EL is aligned by moving 7L in the width direction of the eye and further driving the motor 55 to adjust the inclination of the table 56.

When the alignment is completed, the refraction measuring means 60 is used to measure the refraction of the right eye ER, and then the refraction measuring means 60 is slid on the guide 59 manually or electrically to move it above the left eye optotype system 57L. The refraction measurement of the left eye EL is performed by moving so that the optical axes coincide with each other. Left eye target system 5
Even when 7L is moved left and right, the refraction measuring means 6
0 is slid by the same amount so that the optical axis of the left eye target system 57L and the optical axis of the refraction measuring means 60 always coincide with each other.

When performing the alignment of the left eye EL,
The interpupillary distance can be secondarily calculated from the positions of the left eye optotype 57L and the alignment mark M4 before the alignment work.

FIG. 12 is a plan view of the fourth embodiment. The same members as those in the third embodiment are designated by the same reference numerals and the description thereof will be omitted. Left and right optotypes 76 mounted on the table 56
Objective lenses 77R, 77L, and
The dichroic mirrors 78R and 78L, the dichroic mirrors 79R and 79L, the movable lens groups 80R and 80L that are movable in the optical axis direction and are composed of a plurality of lenses, and the visual targets 64R and 64L are symmetrical in order and are parallel to each other. It is provided in. Dichroic mirror 78R, 7
A switching mirror 81 for switching the optical paths of the left and right eyes is provided on the reflection side of 8L, and a lens 82 as an anterior segment observation means and an image sensor 83 are sequentially provided in the reflection direction of the switching mirror 81. Also, dichroic mirrors 79R, 79R
On the reflection side of L, a switching mirror 84 for switching the optical paths of the left and right eyes
Further, refraction measuring means 85 for measuring eye refraction is provided on the reflection side of the switching mirror 84.

At the time of alignment, the switching mirror 81 is switched to the measurement state of the right eye ER, and in this state, alignment is performed so that the eye ER output to the anterior segment observation television (not shown) reaches the center of the imaging visual field. . Then, the switching mirror 81 is rotated by 90 degrees to bring the left eye measurement state, and the left eye optotype system 76L is moved in the interpupillary direction to adjust the interpupillary distance,
In addition, the platform 56 is tilted to perform alignment so that the eye EL to be inspected reaches the center of the imaging visual field. Here, the right eye system 76R
The interpupillary distance can be measured by providing a means for measuring the position. Next, the right and left eyes are sequentially measured by switching the switching mirror 84.
At this time, the switching mirror 81 and the switching mirror 84 are synchronized with each other so that the state of the subject's eye under measurement is observed. In this case, the order of refraction measurement can be started from either the left or right eye.

In the optical system of the optotypes 76R and 76L, the objective lens 77R and 77L to the moving lens groups 80R and 80L.
On the optical path up to and the optical paths from the moving lens groups 80R and 80L to the targets 63R and 63L are parallel to the light rays from the pupil position.
Since 7R, 77L and the moving lens groups 80R, 80L are selected, even if alignment work such as interpupillary adjustment is performed, the image captured by the image sensor 83 may have a focus, a magnification, or a deviation of the measurement pupil diameter. There is no. However, since the relationship between the fundus and the device changes, it is necessary to make a correction according to the interpupillary distance. In addition, the moving lens group 80R,
Even if 80L is moved, the sizes of the optotypes 64R and 64L do not change.

In the fourth embodiment, the visual target systems 76R, 76R, 7
Two dichroic mirrors 78 and 79 are provided in 6L to perform anterior ocular segment observation and measurement using two switching mirrors 81 and 84, but the observation system and the measurement system are divided after the switching mirrors. If so, it is possible to use only one switching mirror, and the device is simplified.

FIG. 13 is an explanatory diagram of the illumination switch 86 of the left and right optotypes 76L and 76R. Left and right target system 76L, 76
R is configured to be able to illuminate and extinguish independently on the left and right as needed, and FIG. 13 (a) shows the left and right optotype systems 76L,
FIG. 13 (b) shows a state in which the left eye target system 76L is illuminated and the right eye target system 76R is turned off. Oblique measurement is possible by using the left / right illumination / off state. For example, the left and right target system 7
6L and 76R are illuminated at the same time, and in a state where the subject is presented to the subject, the subject's eye for oblique measurement is observed by an anterior segment observation infrared television (not shown). In this state, the optotype system on the measurement side is turned off and the movement of the subject's eye is observed. If there is an oblique line of sight, the line of sight moves, so if the amount of flow of the line of sight is calculated using a video signal, the degree of oblique line can be obtained. In addition, it is possible to inspect the phoria in the far vision that has been accommodating and relieved by the binocular optotype.

[0050]

As described above, the first ocular refractometer according to the present invention can combine the function of performing accurate alignment for the eye refraction measurement with the lens meter.

In the second eye refractometer, one photoelectric detection means guides and measures the left and right eye light beams by using the switching means, so that the apparatus can be simplified and the cost can be reduced.

The third eye refractometer changes the target presented to the other eye in accordance with the refraction measurement value of the eye to be fogged, so that it is possible to prevent the intervention of adjustment on the eye adjustment function.

Since the fourth eye refractometer guides the diopter of the eye to be inspected in a state where the other eye is fogged, the involvement of the accommodation function of the other eye is suppressed and the accommodation of the eye to be inspected is relaxed. Since refraction measurement can be performed, mechanical myopia can be removed and accurate measurement can be performed.

The fifth eye refractometer is a device having the functions of an eye refractometer and a lens meter by guiding the light beam from the lens measuring means to the eye refraction measuring optical system via the optical path coupling means and performing measurement. The degree of freedom is improved.

Since the sixth ophthalmologic apparatus uses two independent optotype systems for measurement, mechanical myopia can be eliminated and accurate measurement can be performed. Further, since the measurement is performed while switching the left and right eye refraction measuring means, the measurement optical system is
If there is one, the cost will be lower.

Since the sixth ophthalmologic apparatus can selectively present the optotype to only one eye, the eye refraction measurement becomes easy.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment.

FIG. 2 is a side view.

FIG. 3 is a front view.

FIG. 4 is a plan view of the second embodiment.

FIG. 5 is a front view.

FIG. 6 is an explanatory diagram of an anterior ocular segment image on a television monitor.

FIG. 7 is a plan view of the third embodiment.

FIG. 8 is a side view.

FIG. 9 is a front view.

FIG. 10 is an explanatory diagram of a left-eye image on a television monitor.

FIG. 11 is an explanatory diagram of a left-eye image on an image pickup unit.

FIG. 12 is a plan view of the fourth embodiment.

FIG. 13 is an explanatory diagram of a lighting switch.

[Explanation of symbols]

 1, 52 Measuring bed 3, 27 Eye measuring optical table 4, 5, 28, 57 Target system 11, 81, 84 Switching mirror 13 Movable mirror 36 Two-dimensional CCD 58, 59 Guide 17, 29, 60, 85 Refraction measuring means 69 TV camera

Claims (8)

[Claims] 1. An eye refraction measurement system that is adjustably arranged at the positions of the left and right eyes, a fixed lens refraction measurement system, and a light guide unit that guides a light beam from the lens refraction measurement system to the eye refraction measurement system. An eye refractometer characterized by having. 2. A corneal curvature measuring light source provided around the optical axis, a binocular optotype system in which one is adjustable in the interpupillary direction, and a left and right eye refraction measurement via a light splitting member provided in the optotype system. An eye refractometer, comprising: a switching unit that sequentially guides light and corneal curvature measurement light to a photoelectric detection unit. 3. A fixation target for each eye, an eye refraction measurement system for sequentially refracting the right and left eyes, and a target for the other eye according to the refraction value measured by the eye refraction measurement system of the eye to be examined. And a control means for determining the diopter of the eye refractometer. 4. A state in which a diopter guide target capable of changing the diopter separately for both eyes, an eye refraction measuring system for sequentially objectively refracting measuring the left and right eyes, and a target with the other eye fixed are shown. 2. An eye refractometer, wherein diopter guidance is performed by the diopter guide and the refraction measurement of the eye is performed by the eye refraction measurement system. 5. A target system which can be adjusted to the positions of both eyes, an objective eye refraction measuring system, a lens measuring means, and an optical path coupling means for guiding the measuring light by the lens measuring means to an eye refraction measuring optical path. An eye refractometer characterized in that 6. A left / right eye target system having diopter changing means, an optical path coupling member provided between the diopter changing means and an eye to be examined, and the left / right eye target system can be switched or moved. And an objective refraction measuring system. 7. The eye refractometer according to claim 6, further comprising means for inclining a member fixing the optotype system and the measuring means. 8. A target system for each of the left and right eyes, an anterior segment observation system, an objective eye refraction measurement system, and means for selectively presenting a target to only one eye. Eye refractometer.