JPH11235316A - Optometry device - Google Patents

Abstract

(57) [Summary] [Problem] To easily and accurately analyze a corneal shape with a simple configuration. SOLUTION: A slit light beam is projected on an anterior segment of an eye to be inspected, and a corneal cross-sectional image C ′ is captured by a television camera 5, and a television monitor 19 including an anterior segment image E ′ and a corneal reflection image 7 ′.
To be displayed. Every time the slit beam projection optical system and the cross-sectional imaging optical system 9 are rotated by 5 degrees with respect to the optical path O1 by the stepping motor 17, an image is fetched from the television camera 5 to the film memory 20 and the meridian image is taken from each corneal image C 'in the meridian direction. The surface shape and the thickness are calculated by the calculating means 18 to create a two-dimensional distribution map thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometry apparatus belonging to an optical technique of an optometry machine.

[0002]

2. Description of the Related Art (1) Conventionally, an optometry apparatus that includes an anterior ocular segment observation optical system and projects a slit light beam to obtain an anterior ocular segment cross-sectional image has been developed.
JP-A-63-197433, JP-A-4-9683
No. 0, Japanese Unexamined Patent Publication No. 7-39518 and the like, wherein the anterior ocular segment observation optical system and the anterior ocular segment image photographing means are configured separately. Further, there is known an apparatus which scans a slit light beam in a lateral direction to capture a corneal scattering cross-sectional image and analyzes a corneal shape.

(2) In an optometry apparatus for performing optometry while mechanically moving a member, a technique is known in which the measurement is interrupted when the eye to be examined moves during the measurement.

[0004] (3) In an apparatus for rotating the imaging means about the optical axis to capture a cross-sectional image of the anterior segment, the slit light beam is projected from the optical axis direction of the target optical system.

[0005]

(B) However, in the above-mentioned conventional example (1), since two optical systems of an anterior ocular segment observation optical system and an anterior ocular segment image photographing means are required, the configuration is However, there is a problem that the operation is complicated and the operation is complicated. Also,
In a device that operates the slit light beam in the lateral direction, since the cross-sectional image is formed by the anterior ocular segment imaging optical system, the magnification of the cross-sectional image is low, and the image is blurred, and accurate analysis is difficult. .

(B) The apparatus for measuring the optometry while mechanically moving the members of the above-described conventional example (2) has a problem that the measurement must be interrupted each time the eye to be examined moves.

(C) In the above-described prior art (3), in the device for rotating the image pickup means around the optical axis to take a sectional image of the anterior ocular segment, the measurement is performed smoothly because the subject feels dazzling. Can not do.

An object of the present invention is to solve the above-mentioned problem (a) and to provide an optometric apparatus for performing accurate corneal shape analysis with a simple configuration.

Another object of the present invention is to provide an optometry apparatus which can solve the above-mentioned problem (b) and can perform measurement without interrupting the measurement even when the eye to be examined moves during the measurement. It is in.

[0010] Still another object of the present invention is to solve the above problems.
An object of the present invention is to provide an optometry apparatus which eliminates (c) and does not give a subject an unpleasant feeling such as dazzling during measurement.

[0011]

To achieve the above object, the present invention provides an optometry apparatus comprising: an anterior segment optical system for forming an image of an anterior segment of an eye to be inspected on an imaging unit; Projecting means for projecting an anterior segment optical system, a sectional optical system for forming an anterior segment scattering cross-sectional image by the slit light beam from the direction inclined to the optical path of the anterior segment optical system on the imaging means, and a display for displaying the anterior segment. Means for performing optometry of the anterior ocular segment.

An optometry apparatus according to the present invention is an optometry apparatus for projecting a light beam to an eye to be inspected, receiving reflected light of the luminous flux, and measuring the optometry. Detecting means for sequentially detecting the position of the optometry during the measurement of the optometry, and performing optometry based on the detection results of the optometry measurement means and the detection means.

Further, the optometry apparatus according to the present invention comprises a fixation optical system for projecting a fixation target to the eye to be examined, and a slit in the anterior segment of the eye to be examined from a direction inclined with respect to the optical axis of the fixation optical system. A projection optical system for projecting a light beam, imaging means for capturing a cross-sectional image of the anterior segment from a direction inclined to the projection optical system, and integrally rotating the projection optical system and the imaging means in a meridional angle direction. And rotating means.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a side view of the first embodiment, and FIG. 2 is a plan view, which shows an optometry apparatus for performing anterior segment measurement such as corneal shape measurement and anterior chamber scattering intensity measurement. Further, it can also be used as an anterior ocular segment photographing apparatus for cataract diagnosis.

A light source 1 for illuminating the anterior eye is disposed in the left and right forward direction of the eye E, and a light splitting member 2, an anterior eye imaging lens 3, and an image sensor 4 are arranged on the optical path O1 from the eye E side. TV cameras 5 are sequentially arranged. On the extension of the optical path O1 in the incident direction of the light splitting member 2, a small aperture stop 6, a wavelength of 70
Fixation point light source 7 that emits red light of 0 nm to 800 nm
Is arranged. On the optical path O2 inclined about 20 degrees with respect to the optical path O1 in the same horizontal plane as the optical path O1, a slit light beam projection optical system 8 is arranged. On the optical path O3, which is inclined at 45 degrees,
A cross-section imaging optical system 9 is provided.

In the slit light beam projection optical system 8, a slit light beam projection lens 10 on the optical path O2, a slit aperture plate 11 having a slit opening curved in the same shape as the cornea C plane along the paper surface, a condenser lens 12, an incandescent lamp A visible light source 13 for photographing, such as a camera or a strobe, is arranged. In the cross-section imaging optical system 9, two mirrors 1 are arranged on an optical path O3.
4, 15 and a lens 16 are arranged. The slit light beam projection optical system 8 and the sectional imaging optical system 9 are integrally formed, and are rotatable about an optical path O1 by a stepping motor 17. The output of the television camera 5 is connected to the calculating means 18, the television monitor 19, and the memory 20, and the output of the calculating means 18 is connected to the stepping motor 17.

At the time of the inspection, the subject is the light splitting member 2,
The fixation point light source 7 is fixedly observed through the small aperture stop 6. The anterior segment illuminated by the anterior segment illuminating light source 1 forms an image on the image sensor 4 by the anterior segment imaging lens 3, is captured by the television camera 5, and displayed on the television monitor 19. Further, the light beam from the point light source 7 is projected onto the cornea C of the eye E through the small aperture stop 6 and the light splitting member 2, and is reflected on the cornea C by a cornea reflection image 7 '.
Is imaged. This corneal reflection image 7 'is also used for alignment, and is not reflected in the optical path O3 direction because it is projected with a thin light beam.

In the slit light beam projection optical system 8, the light beam from the photographing visible light source 13 is
The light is projected onto the eye E from an oblique direction via the slit aperture plate 11 and the slit projection lens 10. Since the projection optical path O2 is inclined with respect to the optical axis O1 of the fixation target, the subject is not dazzling even with visible light, and scattering of the cornea C and the crystalline lens I is stronger in visible light than in infrared light. Therefore, it is preferable to use visible light. Further, since the slit aperture plate 11 is curved along the cornea C plane, the edge of the cornea C can be projected with good focus.

The reflected light from the cornea C travels along the imaging optical path O3 inclined with respect to the optical path O1, is reflected by the two mirrors 14 and 15, and forms a cross-sectional image on the imaging element 4 by the lens 16. Since the slit light beam surface of the anterior segment, the image sensor 4 and the lens 16 are in an optically parallel positional relationship, the cross section of the slit light beam is not distorted, and the image is formed in a state where the entire surface is in good focus. I do.

FIG. 3 shows a cross-sectional image of the anterior ocular segment, and the cross-sectional image is magnified from the anterior ocular segment image for easy analysis. At the time of alignment, all of the light sources 1, 7, and 13 are turned on, and a corneal reflection image 7 ', a corneal cross-sectional image C', and an anterior segment image E 'of the subject's eye E are projected on the television monitor 19, and further electrically. The generated alignment mark M and vertical line N are displayed. The corneal reflection image 7 ′ is put in the mark M, the axes are aligned, and the corneal cross-sectional image C ′ is aligned with the line N to adjust the working distance. Since the anterior ocular segment image E 'and the corneal cross-sectional image C' are both captured by the same television camera 5, they can be displayed on the same television monitor 19, and accurate alignment can be performed.

After the positioning, an anterior ocular segment image is taken in for analysis. The anterior segment illumination light source 1 is turned off, and a scattered image of the cornea C, the crystalline lens L, and the iris I as shown in FIG. Also, the scattering of the anterior chamber A can be recognized by the signal level of this image portion,
A corneal reflection image 7 'is also captured simultaneously for monitoring the position of the eye E.

Each time the slit light beam projection optical system 8 and the section photographing optical system 9 are rotated by 5 degrees, the image is taken from the television camera 5 into the frame memory 20 and continued until the rotation is performed by 180 degrees. The surface shape and thickness of each part of the cornea in the meridian direction are calculated by the calculating means 18 and a two-dimensional distribution map G as shown in FIG. When the eye E moves in the axial direction during data acquisition, the corneal reflection image 7 'moves from a predetermined position, and when it moves in the distance direction, the corneal cross-sectional image position moves laterally. A two-dimensional distribution map G based on the position is calculated and created.

When used for measuring the scattering intensity of the anterior chamber A, it does not need to be rotated and may be fixed. The visible light source 13 such as a strobe light only needs to be emitted once, and the corneal reflection image 7 'is simultaneously captured. do not have to. Further, the length of the slit is made shorter than the pupil diameter, and all the light flux enters the pupil P and the iris I
, The influence of the reflection on the iris I can be eliminated.

FIG. 5 is a side view of the second embodiment, in which members having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals.
The slit projection optical system and the section photographing optical system are integrally formed in a unit 21 in the same plane.
O2 and O3 are inclined by 30 degrees with respect to the optical path O1. The unit 21 is connected to the stepping motor 9 and is rotatable about 180 degrees about the optical path O1.

Further, a prism 22 is used instead of the two mirrors 14 and 15 in FIG. 1, and a slit plate 23 substantially similar to the slit aperture plate 11 is arranged instead of the slit aperture plate 11 and the condenser lens 12. , This slit plate 23
Also has a slit opening that extends along the cornea C and extends in the direction perpendicular to the paper surface. Further, the imaging lens 16 is positioned 30 ° optically parallel to the image sensor 4 and 30 ° from the vertical plane of the optical path O3.
It is arranged at an angle.

A slit light beam having a light beam surface perpendicular to the image pickup device 4 is projected on the anterior eye, and the same operation as in the first embodiment is performed. By doing so, it is possible to take an image without partial blurring of the image and no difference in the partial magnification, so that the apparatus can be easily analyzed in the next step.

[0027]

As described above, the optometry apparatus according to the present invention is provided with an anterior ocular segment observation optical system having a simple configuration, and projects a slit light beam to obtain an anterior ocular segment image, so that accuracy can be easily adjusted. The corneal shape can be well analyzed.

Further, the optometry apparatus according to the present invention can continue the measurement without interruption even when the eye to be examined moves when the optometry is performed while mechanically moving the members.

Further, the optometry apparatus according to the present invention does not give the subject an unpleasant feeling such as dazzling when the imaging means is rotated around the optical path to capture a sectional image of the anterior ocular segment. The optometry measurement can be performed.

[Brief description of the drawings]

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

FIG. 2 is a plan view.

FIG. 3 is an explanatory diagram of an anterior segment scattering cross-sectional image.

FIG. 4 is an explanatory diagram of a two-dimensional measurement result of a cornea.

FIG. 5 is a side view of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source for illumination of anterior eye part 2 Light splitting member 5 TV camera 7 Point light source for fixation 8 Slit light beam projection optical system 9 Sectional imaging optical system 11 Slit aperture plate 13 Visible light source for photographing 17 Stepping motor 18 Arithmetic means 19 TV monitor 21 unit 22 prism 23 slit plate

Claims (8)

[Claims] 1. An anterior segment optical system for imaging an anterior segment of an eye to be examined on an imaging unit, a projecting unit for projecting a slit light beam on the anterior segment, and a direction inclined to an optical path of the anterior segment optical system. A cross-sectional optical system for forming an anterior segment scattered cross-sectional image by the slit light beam on the imaging unit; and a display unit for displaying an anterior segment, and performing an optometry of the anterior segment. apparatus. 2. The optometry apparatus according to claim 1, wherein the shape of the anterior segment is calculated from the scattered cross-sectional image of the anterior segment. 3. The optometry apparatus according to claim 2, further comprising a rotation unit configured to rotate the cross-sectional optical system about an optical axis of the anterior segment optical system, and to calculate a two-dimensional shape of the anterior segment. 4. The optometry apparatus according to claim 1, wherein a scattered intensity of the anterior segment is detected from the scattered sectional image of the anterior segment. 5. The optometry apparatus according to claim 4, wherein the anterior segment is an anterior chamber. 6. The optometric apparatus according to claim 1, wherein a plane of the slit light beam projected on the anterior segment and an imaging plane of the imaging unit are optically parallel to each other. 7. An optometry apparatus for projecting a light beam to an eye to be examined and receiving reflected light thereof to measure an optometry, wherein the optometry measurement means for performing optometry while mechanically moving a member, and the position of the eye to be examined is measured during the optometry. And detecting means for sequentially detecting the
An optometry apparatus for performing optometry based on detection results of the optometry unit and the detection unit. 8. A fixation optical system for projecting a fixation target to an eye to be inspected, and a projection optical system for projecting a slit light beam to an anterior eye of the eye from a direction inclined with respect to an optical axis of the fixation optical system. An imaging unit that captures a cross-sectional image of the anterior eye from a direction inclined to the projection optical system, and a rotation unit that integrally rotates the projection optical system and the imaging unit in a meridional angle direction. An optometric device.