JPH0788082A - Device for optometry - Google Patents

Abstract

PURPOSE:To take an accurate photograph of the fundus by making an alignment with easy operation, examining the image of the eye front. CONSTITUTION:The reflected rays on the examined eye E from the light source 21 for the eye front illumination are received at the TV camera 10, and the image of the eye front E' is shown on the TV monitor 11. The position of the light source 16 for fixed gaze is adjusted, the direction of the gaze of the examined eye E is monitored, the shape of the fundus Eo is shown on the small screen 11a, and the position of the examined part is determined. On the other hand, the reflected rays on the fundus Er from the light source 19 for focusing are received at the photoelectricity sensor 18, and according to information, the focus lens 6 is focused. In this way, after making an accurate alignment, the fundus image by the light source 20 for the fundus illumination is photographed using the film 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometry apparatus used in an ophthalmic hospital or the like.

[0002]

2. Description of the Related Art Conventionally, in alignment performed by a fundus camera, focusing and position adjustment are performed while observing a fundus image of an eye to be examined displayed on a television monitor or the like. In this case, since the anterior segment of the eye to be inspected is not observed, it is difficult to accurately focus due to the refractive power of the eye to be inspected, or the precise position of the measurement site cannot be grasped because the direction of the line of sight is unknown. Otherwise, problems such as the occurrence of misalignment of the eye to be inspected at the time of shooting due to operation of the shutter button are likely to occur, which is a cause of shooting errors.

For this reason, the alignment is confirmed by displaying the fundus image and the anterior segment image on different displays or by switching the screens with a single display.

[0004]

However, in the above-mentioned conventional example, when the display screen is switched from the fundus observation to the anterior segment observation, the fixation lamp cannot be visually recognized by the subject. Then, the eye to be inspected moves and it becomes necessary to realign. Further, if there are a plurality of display screens, there is a problem that the device becomes large and the cost becomes high.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an optometry apparatus that is easy to operate by performing focusing and positioning while observing the anterior segment of the eye.

[0006]

An eye examination apparatus according to a first aspect of the present invention for achieving the above object comprises a detecting means for detecting a line-of-sight direction and a graphic generating means for generating a fundus graphic on a display surface. The eye fundus figure is moved based on the signal of the detection means.

The optometry apparatus according to the second aspect of the present invention has an anterior segment observation optical system provided with an alignment mark, and a fundus image recording unit for operating the operating unit to record a fundus image during observation of the anterior segment. Is characterized by.

[0008]

The optometry apparatus of the first invention having the above-mentioned configuration observes the anterior segment image to detect the line-of-sight direction of the eye to be inspected, displays the fundus figure on the display surface, and based on the detected line-of-sight direction Move the fundus figure.

Further, the eye examination apparatus of the second invention aligns the alignment mark with the anterior segment image displayed by the anterior segment observation optical system and records the fundus image while observing the anterior segment.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows a first embodiment. In front of the eye E to be examined, an objective lens 2, a switching mirror 3, a perforated mirror 4,
A focus lens 6, an image forming lens 7, and a photographing film 8 which are moved in the optical axis direction by a driving device 5 are arranged. A dichroic mirror 9 and a television camera 10 are arranged in the reflection direction of the switching mirror 3, and the output of the television camera 10 is connected to a television monitor 11 and a signal processor 12.

Further, a half mirror 13, a lens 14, a dichroic mirror 15, and a light source 16 for fixation are arranged in the reflecting direction of the dichroic mirror 9, and a photoelectric sensor composed of a lens 17 and a CCD in the reflecting direction of the half mirror 13. 18
And a focusing light source 19 is provided in the reflection direction of the dichroic mirror 15. A lens 19 and a fundus illuminating light source 20 are arranged in the incident direction of the perforated mirror 4. Further, a plurality of anterior ocular segment illumination light sources 21 are provided around the objective lens 2.

Here, the output of the photoelectric sensor 18 is connected to the signal processor 12. The output of the joystick 23 having the shutter button 22 is connected to the driving device 5, the fundus illuminating light source 20, the fixation light source 16, and the signal processor 12.

When the anterior ocular segment illumination light source 21 is turned on to illuminate the anterior ocular segment of the subject's eye E, the anterior ocular segment image E'is formed on the television camera 10 through the objective lens 2, the switching mirror 3 and the dichroic mirror 9. Then, it is displayed on the television monitor 11. The screen of the television monitor 11 is observed, the alignment mark A is superimposed on the pupil image Ep ′, and the joystick 23 is operated so as to adjust the position and focus.

On the other hand, the light flux from the focusing light source 19 is projected from a part of the pupil Ep to the fundus Er through the dichroic mirror 15, the lens 14, the half mirror 13, the dichroic mirror 9, the switching mirror 3 and the objective lens 2. This reflected light returns in the reverse direction of the optical path, is reflected by the half mirror 13, passes through the lens 17, and is received by the photoelectric sensor 18. Based on the received light flux, the signal processor 12 drives the focus lens 6 via the drive device 5 to adjust the fundus Er and the photographic film 8 to be conjugate with each other.

Further, by turning on the light source 16 for fixation and instructing the subject to gaze at the light source 16 for fixation, based on the output of the photoelectric sensor 18, the signal processor 12 detects the eye E. The direction of the line of sight is detected, that is, the fundus region to be photographed is calculated by the signal processor 12 from the relative position between the image 21a of the anterior segment illumination light source 21 and the pupil image Ep 'of the anterior segment image E'. The small screen 11 of the TV monitor 11
It is displayed as a fundus view Eo in a. For example, if the pupil image Ep 'is on the optical axis, the fundus figure Eo centered on the macula diagram is displayed on the small screen 11a. The examiner moves the position of the light source 16 for fixation as shown by an arrow, and the fundus Er of the eye E to be imaged is to be photographed.
Select the part of.

In this way, the examiner can perform alignment while observing the anterior segment image E ', and at the same time, can confirm the imaging region of the fundus Er based on the fundus figure Eo. Further, the anterior segment image E ′ and the fundus figure Eo can be switched and displayed alternately on the television monitor 11.

When the shutter button 22 is pressed after completion of these alignments, the switching mirror 3 is raised to the dotted line position,
The light flux emitted from the fundus illuminating light source 20 passes through the lens 19, is reflected by the perforated mirror 4, enters the subject's eye E through the objective lens 2, and illuminates the fundus Er. The reflected light from the fundus Er returns to the reverse optical path, passes through the hole of the perforated mirror 4, passes through the focus lens 6 and the imaging lens 7, and is recorded on the film 8 for photographing.

FIG. 2 shows a second embodiment. In front of the eye E to be examined E, an objective lens 32, a dichroic mirror 33,
A lens 34, a dichroic mirror 35, and a television camera 36 are arranged, and the output of the television camera 36 is connected to a television monitor 37 and a signal processor 38.

In the reflection direction of the dichroic mirror 33, a half mirror 39 conjugate with the pupil Ep, a dichroic mirror 40, a lens 41, a filter 42, and a fundus illuminating light source 4
3, the filter 42 has a characteristic of separating the anterior segment illumination light source 31 and the fundus illumination light source 43 by wavelength. In the reflection direction of the half mirror 39, the focus lens 45 and the total reflection mirror 4 driven by the drive device 44.
6, the focusing sensor 48 is arranged to pass through the imaging lens 47 and the dichroic mirror 35, and the optical path reflected by the dichroic mirror 35 coincides with the optical path on the visual axis of the eye E to reach the television camera 36. There is. Further, a dichroic mirror 49 and a light source for fixation 50 are provided in the incident direction of the dichroic mirror 40, and a focusing light source 51 is provided in the incident direction of the dichroic mirror 49. Further, a plurality of anterior ocular segment illumination light sources 52 are arranged around the objective lens 32.

The image of the anterior segment illuminated by the anterior segment illumination light source 52 is the objective lens 32 and the dichroic mirror 3.
An image is formed on the television camera 36 through the lens 3, the lens 34, and the dichroic mirror 35, and is displayed on the television monitor 37.
In this case, the fundus figure Eo can be displayed using the small screen 11a as shown in FIG. 1 as in the first embodiment.

The light flux from the focusing light source 51 is projected onto the fundus Er of the eye E to be examined through the dichroic mirrors 49 and 40, the half mirror 39, the dichroic mirror 33, and the objective lens 31, and the reflected light on the fundus Er reverses the optical path. Then, the light is reflected by the half mirror 39, transmitted through the focus lens 45, the total reflection mirror 46, the imaging lens 47, the dichroic mirror 35, and received by the focus sensor 48.
Also in this case, the focus lens 45 is moved by the driving device 44 to focus on the basis of the output of the focusing sensor 48 as in the first embodiment.

When the fundus illuminating light source 43 is caused to emit light for fundus photography, the luminous flux of the fundus Er passes through the filter 42, the lens 41, the dichroic mirror 40, the half mirror 39, the dichroic mirror 33, and the objective lens 31.
The reflected light is reflected in the reverse optical path, follows the same optical path as the light flux from the focusing light source 51, is reflected by the dichroic mirror 35, and is received by the television camera 36.
The fundus image Er 'is displayed on the television monitor 37 as shown in FIG. 2, and at the same time, the fundus image Er' is stored in the memory of the signal processor 38.

In this case, the dichroic mirror 35 may be a movable mirror and may be instantaneously inserted into the optical path at the time of photographing the fundus.

FIG. 3 shows a third embodiment, which is an apparatus combining a fundus camera and an autorefractometer. In front of the eye E to be examined E, an objective lens 61, a switching mirror 62, a perforated mirror 63, a cross cylinder lens 65 driven by a driving device 64, a focus lens 67 driven by a driving device 66, an imaging lens 68, a switching lens. Mirror 6
9. Films 70 for photography are arranged. A dichroic mirror 71, a lens 72, and a television camera 73 are provided in the reflection direction of the switching mirror 62, and the output of the television camera 73 is connected to a television monitor 74.

In the reflecting direction of the dichroic mirror 71, a perforated mirror 75, an aperture 76, a lens 77,
A refraction measuring light source 78 is arranged, and an aperture 79, a separating prism 80, a lens 81, and a refraction measuring sensor 82 are provided in the reflection direction of the perforated mirror 75. A lens 83 and a fundus illuminating light source 84 are arranged in the incident direction of the perforated mirror 63. Switching mirror 69
Lens 85 and dichroic mirror 8 in the incident direction of
6. Refraction measuring target 8 illuminated by the illumination light source 87
8 is provided, and the fixation light source 89 is arranged in the incident direction of the dichroic mirror 86.

At the time of alignment, the fundus camera,
In any case of the refractometer, the television camera 73 receives the reflected light from the anterior segment of the eye E to be inspected, and the television monitor 7
While observing the anterior segment image E'displayed in 4, the alignment mark A is superimposed on the pupil image Ep '. At this time, if the diameter of the alignment mark A is changed or the shape is made into a double circle according to the purpose, more accurate alignment can be performed.
Usually, it is preferable that the diameter of the alignment mark A is displayed according to the diameter of each used light beam.

In objective measurement by a refractometer, the light flux from the refraction measuring light source 78 is reflected by the lens 77,
It is projected on the eye E through the aperture 76, the perforated mirror 75, the dichroic mirror 71, the switching mirror 62, and the objective lens 61, and the reflected light returns in the reverse optical path and is reflected by the perforated mirror 75, and the aperture 79, the separation. The light is received by the refraction measuring sensor 82 via the prism 80 and the lens 81. Then, the refracting power and the like are calculated from the position and shape of the reflected light image obtained by the refraction measuring sensor 82, and the focus lens 67 and the cross cylinder lens 65 are respectively driven based on the obtained spherical degree and astigmatism degree. Move and adjust with 66 and 64.

In the subjective measurement, the light flux from the refraction measurement target 88 illuminated by the illumination light source 87 is dichroic mirror 86, lens 85, and switching mirror 6.
9, the lens 68, the focus lens 67, the cross cylinder lens 65, the perforated mirror 63, and the objective lens 61, and the image is projected onto the eye E to be inspected.
8 is observed.

In the case of fundus photography, the fixation light source 89 is observed by the subject. The position of the light source 89 for fixation is detected, and then the photographing fundus region is calculated and displayed on a small screen. While moving the light source for fixation 89, the degree of matching between the alignment mark A and the pupil image Ep 'on the television monitor 74 is judged to select the fundus region, and the switching mirror 62 is removed from the optical path by an operation means (not shown) to illuminate the fundus. When the use light source 84 is caused to emit light, the light flux is projected onto the fundus Er of the eye E through the lens 83, the perforated mirror 63, and the objective lens 61, and the reflected light on the fundus Er returns to the reverse optical path, and the objective lens 61, the hole Open mirror 63, cross cylinder lens 6
After passing through 5, the focus lens 67 and the imaging lens 68, it is recorded as a fundus image on the photographing film 70. A refractometer function can be used for this fundus image focus.

If the switching mirrors 62 and 69 are dichroic mirrors reflecting near infrared light and transmitting visible light,
The switching operation may not be performed.

FIG. 4 shows a fourth embodiment. In front of the eye E to be inspected, an objective lens 91, a switching mirror 92, a perforated mirror 93, a focus lens 94, an image forming lens 95, a switching mirror 96, and a photographing mirror. The film 97 is arranged. A lens 98 and a television camera 99 are arranged in the reflecting direction of the switching mirror 92, and a lens 100, a dichroic mirror 101, and a fundus illuminating light source 102 are provided in the incident direction of the perforated mirror 93. A focusing light source 103 is provided in the incident direction. A lens 104, a dichroic mirror 105, and a focusing sensor 106 are arranged in the reflection direction of the switching mirror 96, and a fixation light source 107 is provided in the incident direction of the dichroic mirror 105.

For focusing, when the switching mirror 92 is removed from the optical path and the focusing light source 103 emits light, the light flux passes through the dichroic mirror 101, the lens 100, the perforated mirror 93, and the objective lens 91 to the fundus Er of the eye E to be examined. Projected. The reflected light from the fundus Er passes through the objective lens 91, the perforated mirror 93, the focus lens 94, and the lens 95, is reflected by the switching mirror 96, passes through the lens 104 and the dichroic mirror 105, and the focus sensor 106.
Is received by. The focus lens 94 is driven and focused by the signal at this time.

Further, the switching mirror 92 is inserted in the optical path, alignment is performed while observing the anterior segment on the television monitor based on the output of the television camera 99, and the fixation light source 107 is set as in the above-described embodiment. By moving, the fundus region is selected according to the position of the alignment mark.

During fundus photographing, the switching mirrors 92, 9
6 is removed from the optical path, the light source 102 for illuminating the fundus of the eye is emitted,
The fundus Er of the eye E is irradiated through the perforated mirror 93, the objective lens 91 and the like, and the reflected light is photographed as a fundus image by the photographing film 97 through the objective lens 91, the focus lens 94 and the like.

[0035]

As described above, the optometry apparatus according to the first aspect of the present invention detects the anterior segment image by detecting the line-of-sight direction of the subject's eye and displaying the fundus figure on the anterior segment image display means. The measurement site can be selected by simple operation while observing.

The optometry apparatus according to the second aspect of the present invention observes the anterior segment image and performs alignment and focusing by using the alignment mark, thereby enabling accurate alignment,
Capable of shooting fundus images without any shooting mistakes.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a second embodiment.

FIG. 3 is a configuration diagram of a third embodiment.

FIG. 4 is a configuration diagram of a fourth embodiment.

[Explanation of symbols]

 8, 70, 97 Film 11, 37, 74 TV monitor 10, 36, 73, 99 TV camera 12, 38 Signal processor 22 Shutter button 23 Joystick 16, 50, 89, 107 Fixing light source 18 Photoelectric sensor 48, 106 Focus sensor 19, 51, 103 Focus light source 20, 43, 84, 102 Fundus illumination light source 21, 52 Anterior ocular segment illumination light source 78 Refraction measurement light source 82 Refraction measurement sensor 88 Refraction measurement target

Claims (2)

[Claims] 1. An optometry apparatus comprising: detection means for detecting a line-of-sight direction; and graphic generation means for generating a fundus graphic on a display surface, and moving the fundus graphic based on a signal from the detection means. . 2. An eye examination apparatus comprising an anterior segment observation optical system provided with an alignment mark and a fundus image recording unit for recording a fundus image by operating an operating unit during observation of the anterior segment.