JPH02268737A - Ophthalmic stereoscopic measuring apparatus - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an ophthalmologic stereo imaging device that obtains stereo images by photographing fundus images symmetrically at a predetermined distance from the center of the pupil.

[Prior Art] Conventionally, as a method for obtaining a stereo image of the fundus, a method has been proposed in which the optical axis is moved left and right within the pupil of the eye to be examined to obtain respective images.

[Problems to be Solved by the Invention] However, there is a drawback that, depending on the size and shape of the object, sufficient accuracy may not be obtained if the image is photographed with only one shift in the left-right direction as in this conventional example.

An object of the present invention is to provide an ophthalmologic stereo imaging device that obtains stereo images from a plurality of images.

[Means for Solving the Problems] In order to achieve the above object, the ophthalmologic stereo imaging apparatus according to the present invention includes an illumination optical system that illuminates the fundus of the eye to be examined, and a photographic optical system that photographs the fundus. a light flux moving means for moving the optical axis of the fundus photographing means within the pupil of the eye to be examined symmetrically with respect to approximately the center of the pupil in order to obtain a stereo image of the fundus; a light flux rotating means for rotating the light flux around the center of the pupil in order to obtain it along various meridian directions; and an image receiving means disposed behind the photographing optical system for receiving each fundus image forming a stereoscopic image of the fundus; The apparatus is characterized by comprising an arithmetic processing means for processing each fundus image from the image receiving means and integrating information for each meridian direction of the stereo image to complete a stereo image result.

[Operation] The ophthalmological stereo imaging device having the above configuration captures a pair of images in various meridian directions to obtain a stereo image, processes these images, and combines the results to create a single image. Create a complete stereo image.

〔Example] The present invention will be explained in detail based on illustrated embodiments.

In FIG. 1, a condenser lens 2. A deflection mirror 3, a ring slit 4, a relay lens 5.6, and a perforated mirror 7 are arranged, and the light beam is reflected by the perforated mirror 7 and enters the eye E through the objective lens 8. The reflected light from the eye E to be examined is reflected by the objective lens 8. A focusing lens 9 passes through the perforated mirror 7 and is arranged behind the perforated mirror 7. The light enters the imaging means 11 via the photographing lens IO. The output of the imaging means 11 is connected to an image processor 12, and the image processor 12 is connected to a cRT-13 and a pulse signal generator 14. Further, in front of the objective lens 8, there is provided a parallel plane plate 15 made of transparent glass, for example, which is rotatably arranged at a predetermined angle.
but.

It can be inserted arbitrarily into the optical path.

The light emitted from the condenser lens 2. The light is focused onto a ring slit 4 by a deflection mirror 3. The ring-shaped light beam emitted from the ring slit 4 passes through the relay lens 5.6.
Once the image is formed near the perforated mirror 7, it is reflected.
An objective lens 8 forms an image near the pupil Ei of the eye 9 to be examined to illuminate the fundus Ef. The reflected light from the fundus Ef is the pupil E
i, an aerial image is formed by the objective lens 8, passes through the hole of the perforated mirror 7, passes through the focusing lens 9, the photographing lens 10, and is imaged onto the imaging means 11.

During normal fundus W1 observation, the parallel plane plate 15 is
As shown in the figure, it is retracted from a position in front of the objective lens 8, and is inserted in a position in front of the objective lens 8 during stereo photography. Further, alternate selection of the two inclined positions of the parallel plane plate 15 and selection of each meridian direction position for obtaining a pair of stereo images are performed by a pulse signal from the pulse signal generator 14 that receives a signal from the image processor 12. This can be done by driving a stepping motor (not shown). Images at each position on the parallel plane plate 15 are captured from the imaging means 11 according to instructions from the image processor 12, and are recorded in a frame memory or the like, thereby facilitating image measurement.

In FIG. 2, by moving the parallel plane plate 15 to a reverse tilt position n15' in the opposite direction by an amount equivalent to a predetermined angle from the position indicated by the solid line, the fundus imaging axis is shifted by a predetermined amount, and the deviation by the base line length a is This shows that it is possible to obtain Also, at this time, the fundus illumination light flux L1, L2, the photographing light flux L3. L4
The positional relationship within the pupil Ei is as shown in FIG.
Next, the parallel plane platework 5 is rotated by an angle θ, which is separated in the 1M direction, which is the base line length direction, and two tilted states are formed at this position, and images are taken at each position. At this time, the positional relationship within the pupil Ei of the fundus illumination light beams Ll', [,2' and the photographing light beams L3', L4' is as shown in FIG. 4, and L'M', which is the base line length direction,
Separated in force direction.

The images in the above state, that is, the pair of images shown in FIGS. 5(a) and (b) obtained from the state shown in FIG. 3, and the pair of images shown in FIGS. 6(a) and (b) obtained from the state shown in FIG. ) are respectively taken into the microprocessor 12 via the imaging means 11, subjected to image processing, measurement, and calculation, interpolation, etc., and the results are displayed on the CRT 13.

[Effects of the Invention] As explained above, the ophthalmologic stereo imaging device according to the present invention obtains three-dimensional information of the fundus from a stereo image of the fundus, not only in one set, that is, in the l meridian direction, but also in multiple meridian directions. By capturing images and performing image processing, measurement, calculation, and integration, it is possible to interpolate information from each other and obtain more accurate results.

[Brief explanation of drawings]

The drawings show an embodiment of the ophthalmological stereo imaging device according to the present invention, in which Fig. 1 is a configuration diagram, Fig. 2 is an explanatory diagram of optical axis movement by a parallel plane plate, and Figs. 3 and 4 are illustrations of the intrapupil. FIG. 5(a) is an explanatory diagram of the position of the light beam at . 6(b), FIG. 6(b) are explanatory diagrams of one set of stereo images, respectively. 1 is a light source, 2 is a condenser lens, 3 is a mirror 4
is a ring slit, 5 and 6 are relay lenses, 7 is a perforated mirror, 8 is an objective lens, 9 is a focusing lens,
10 is a photographing lens, 11 is an imaging means, 12 is an image processor, 13 is a CRT, 14 is a pulse signal generator, 1
5 is a parallel plane plate, Ll, L2. Llo, L2'' are illumination light fluxes, L3, L4゜L3', L4' are photographing light fluxes. Patent applicant Canon Co., Ltd. Figure 3 Figure 4 @ Figure 5 (CI> (b) Figure 6

Claims (1)

[Claims] 1. A fundus photographing means having an illumination optical system for illuminating the fundus of the eye to be examined and a photographing optical system for photographing the fundus, and an optical axis of the fundus photographing means having an optical axis within the pupil of the eye to be examined to obtain a stereo image of the fundus. a light flux moving means for moving the light flux to a position symmetrical with respect to the pupil center; a light flux rotation means for rotating the light flux around the pupil center in order to obtain a stereo image of the fundus along each meridian direction of the pupil; and the photographing optical system. An image receiving means is placed behind the image receiving means to receive each fundus image forming a stereo image of the fundus, and image processing is performed on each fundus image from the image receiving means and information for each meridian direction of the stereo images is integrated to obtain a stereo image result. 1. An ophthalmologic stereo imaging device comprising: arithmetic processing means for completing the above steps.