JP2738849B2 - Ophthalmic examination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an ophthalmologic examination in which an alignment of an eye to be inspected is adjusted with illumination light, for example, infrared light, and then an image of the eye to be inspected is captured with visible light. Related to the device.

(Prior Art) Conventionally, an ophthalmic examination apparatus irradiates illumination light, for example, infrared light, to a subject's eye to perform focusing and alignment adjustment of the subject's eye, and then irradiates visible light to the subject's eye. A device that performs photography is known.

As this type of ophthalmic examination apparatus, a non-mydriatic retinal camera that shoots with a film while keeping the eye to be examined in a natural non-mydriatic state without using a mydriatic is known.

Since this non-mydriatic retinal camera illuminates the subject's eye with infrared light when observing the subject's eye, it uses a television camera that has sensitivity not only in the visible region but also in the infrared region. The observation image of the optometry is made into a visible image on a television monitor, and after adjusting the alignment and the like with this, the fundus of the eye to be examined is irradiated with visible light to photograph the fundus image on a film.

On the other hand, in recent years, with the development of image processing technology, computer technology, and the development of large-capacity storage devices such as optical disks, attempts have been made to store and use images as digital or analog electronic image information instead of conventional film shooting. I have. The same applies to ophthalmological photographs, including illumination light,
For example, in a conventional ophthalmic examination apparatus that observes the subject's eye with infrared light and shoots with visible light, when shooting as an electronic image instead of film, the TV camera used for observation is also used when shooting with visible light It can be used.

(Problems to be Solved by the Invention) In this case, however, since the imaging position of the fundus image is different between the infrared light and the visible light, even if the observation is performed with the infrared light and focusing is performed, the visible light is captured. In such a case, there is a problem that the focus cannot be achieved.

In addition, an index is placed on the observation optical system for alignment adjustment at the time of observation, and alignment adjustment is performed based on this index. There is a problem that the target image is sometimes photographed while being superimposed on the fundus image.

Therefore, there is a problem that a television camera used for observation cannot be used for fundus photography.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems of the prior art, and there is a problem of a focus shift caused by a difference in wavelength between visible light and infrared light, and a problem of an index image being captured during photographing. It is an object of the present invention to provide an ophthalmologic examination apparatus that can share a television camera used for observation even when photographing.

(Means for Solving the Problems) In order to achieve the above object, the invention according to claim 1 is a method for irradiating an infrared ray to an eye to be inspected at the time of observation of the eye to be inspected. An ophthalmic examination apparatus having an imaging optical system for projecting and photographing by a conversion device, and a display unit for displaying the infrared light eye image as a visible image based on a signal from the photoelectric conversion device during observation of the eye to be inspected In the eye to be inspected to project the image of the eye to be obtained by irradiating the eye with the visible light to the photoelectric conversion device via the imaging optical system, the image projected onto the photoelectric conversion device A recording unit capable of recording an image of the eye to be examined as an electronic image, and an eye image of the infrared light and an eye of the visible light, which are provided in the imaging optical system and are projected on the photoelectric conversion device when photographing the eye to be inspected. A focus position correcting means for correcting a shift of each focal position from an image; An ophthalmologic examination apparatus comprising:

(Operation) According to the ophthalmologic examination apparatus according to claim 1 of the present invention, an infrared eye image of an eye obtained by irradiating the eye with the infrared light at the time of observation of the eye is transmitted through the imaging optical system. And projected on the photoelectric conversion device. At this time, an infrared eye image to be inspected and a reference index image for alignment are projected onto the photoelectric conversion device. These images projected on the photoelectric conversion device are displayed as visible images by the display unit. Thereby, alignment adjustment of the subject's eye can be performed. At the time of photographing the subject's eye, the subject's eye image in the visible term is projected onto the photoelectric conversion device via the imaging optical system. At this time, the focusing position correcting means corrects the focus position of the infrared light and the visible position. The deviation of the focus position of the light is corrected, and the eye image to be inspected by visible light is formed on the photoelectric conversion device. The eye image of the visible light is displayed on the display unit. The visible light eye image projected on the photoelectric conversion device is stored in the storage unit and used as image information of the eye.

According to the second aspect of the present invention, the reference index image for alignment is eliminated when the eye to be inspected is photographed, so that only the image of the eye to be inspected is projected on the photoelectric conversion device.

According to the ophthalmic examination apparatus of the third aspect, the reference index image for alignment adjustment is recorded in the pattern signal recording section, and this reference index image is used when displaying the electronic image of the eye image to be inspected on the display section. In addition, since the electronic image of the eye to be inspected is superimposed and displayed, the alignment of the eye to be inspected can be adjusted.

(Embodiment) A fundus camera according to an embodiment of the ophthalmologic examination apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration of a fundus camera 1 according to the present embodiment. The fundus camera 1 is an imaging optical system 10 for observing and photographing the eye 2 to be inspected, and an illumination for irradiating the eye 2 with illumination light. An optical system 20 and a television camera that receives an image from the imaging optical system 10
30 (photoelectric conversion device), a controller 40 (storage unit) capable of storing an image received by the TV camera 30, and a TV camera
A television monitor (display unit) that displays the image received at 30 as a visible image, and a film camera 60 that captures the image of the eye to be examined
A glass plate 70 as a focus position correcting unit, a reticle / glass plate driving unit 80 as an index image canceling unit for canceling an alignment index during observation, and a working distance of the fundus camera 1 with respect to the eye 2 to be inspected. And a working distance index projection system 90 for irradiating a working distance adjustment index for the operation.

The imaging optical system 10 includes an objective lens system 11 facing the subject's eye, a perforated mirror 12 that reflects illumination light from the illumination optical system 20 to the subject's eye 2 via the objective lens system 11, and a working distance index projection system.
A small mirror 13 for irradiating the subject's eye 2 with a working distance adjustment index from 90, a focusing lens system 14, an imaging lens system 15, a quick return mirror 16, a reticle 17, and a reflection mirror 18
And a relay lens 19. The small mirror 13 is located outside the optical path 1 of the imaging optical system 10, and the working distance adjustment index projected from the working distance index projection system 90 is a perforated mirror 12.
Further, it is set so as to be projected via the objective lens system 11 to a half point α of the center of curvature of the cornea of the subject's eye 2 and to be reflected by the cornea as a parallel light flux. Further, the quick return mirror 16 is provided with a quick return mirror driving unit 16a driven by the control of the controller 40, so that even when photographing is performed by the television camera 30 during observation, the image from the imaging lens system 15 is transmitted to the television camera 30. It is located in the ascending position so as to lead to. And this quick return mirror 16,
When taking a picture with the film camera 60, it is located at the lowered position, and forms an image from the imaging lens system 15 on the film 61 of the film camera 60. The reticle 17 has an alignment index for performing alignment adjustment of the subject's eye 2,
The image reflected by the quick return mirror 16 is provided so as to be once formed by the reticle 17. In this embodiment, the quick return mirror 16 and a glass plate described later are used.
The glass plate 70 and the reticle 17 are slid by the index image eliminating means 80.

The illumination optical system 20 includes an illumination light source 21 for observation, a strobe tube 22 as an illumination light source for photographing, an observation condenser lens system 23 for condensing light from the illumination light source 21, and a strobe tube 22.
The condenser lens system 24 for taking light from the condenser lens and the hot mirror that reflects only the infrared component of the light from the condenser lens system 23 for observation and transmits the visible component of the light from the condenser lens system 24 for photography 25, a ring stop 26 for forming light from the hot mirror 25 in a ring shape, and a ring stop 26
And an illumination relay lens system 27 for guiding ring light from the lens to the perforated mirror 12 of the imaging optical system 10.

The illumination light source 21 for observation is controlled by the controller 40 to emit light, and emits light according to a command from the controller 40 when the fundus camera 1 is in the observation state. The flash tube 22 for photographing is connected to a controller 40 via a flash drive unit 22a. Strobe tube 22 is a controller
The light emission is controlled by 40 and emits light when the fundus camera 1 shoots.

A controller 40 is connected to the television camera 30 as a photoelectric conversion device, and an image received by the television camera 30 is stored in a frame memory 41 of the controller 40 (see FIG. 2).

The controller 40 includes the above-described frame memory 41, an interface 42, and a CPU 43 as a central processing unit. The CPU 43 has a reticle / glass drive unit 80 and a quick return mirror drive unit 16a via the interface 42. And the strobe drive unit 22a and the TV camera 30
And a trigger switch 22 for firing the strobe tube 22
b, a mode setting unit 44 for setting any one of a television camera shooting mode for shooting with the TV camera 30 and a photo shooting mode for shooting with the film camera 60, and an external storage device such as a disk device. The mass storage 45 is connected.

The controller 40 controls the fundus camera 1 as follows.

First, when a main switch (not shown) of the fundus camera 1 is turned on, the CPU 43, the television camera 30, and the television monitor 50 are turned on.
Rises, the illumination light source 21 for observation is turned on, and the working distance adjusting device 90 becomes operable.
Becomes an observation state for observing the subject's eye 2.

In the observation state, the reticle / glass plate driving unit 80 inserts the reticle 17 onto the optical path 1 of the coupling optical system 10 according to a signal from the CPU 43, and the quick return mirror driving unit 16a moves the quick return mirror 16 to the raised position. Is controlled. In this state, the eye image projected on the television camera 30 is displayed on the television monitor 50 via the frame memory 41. The working distance adjusting device is operated by the observer who observes the eye image displayed on the television monitor 50.
The working distance of the fundus camera 1 is adjusted based on the working distance adjustment index from 90, and the alignment adjustment is performed so that the fundus image of the eye 2 to be inspected is located at the center position of the alignment index of the reticle 17 and displayed on the television camera 30. When the focus is adjusted, the fundus camera 1 is ready to take a picture.

Next, when the television camera shooting mode is set by the mode setting switch 44 and the trigger switch 22b, which is the shooting switch, is turned on, an ON signal of the trigger switch 22b is input to the CPU 43 via the interface 42, and at the same time, C
In response to a command from the PU 43, the reticle / glass plate driving unit 80 is driven via the interface 42, the glass plate 70 is positioned at the position where the reticle 17 was located, and then the strobe driving unit 22a is driven to connect the strobe tube 22. Flash. The flash tube 22 emits light in synchronization with the image reception timing of the television camera 30 based on a signal from the video sync separation unit 41a. The fundus image of the eye to be inspected 2 obtained by the light emission of the strobe tube 22 forms an image on the light receiving surface of the television camera 30 via the glass plate 70, is photoelectrically converted by the television camera 30, and is newly stored in the frame memory 41. It is memorized.

The frame memory 41 is capable of storing the image received by the television camera 30 in the frame memory 41 itself, and when the eye image to be inspected is received a plurality of times, from among the images of the eye images to be inspected, the controller 40 It is also possible to display a desired image on the television monitor 50 based on the instruction. The frame memory 41 can transmit an image signal directly to the television monitor 50 during observation, and when an image signal is input from the frame memory 41 to the television monitor 50,
At 50, the alignment index image and the image of the subject's eye are displayed as visible images. Also, when in the TV camera shooting mode,
The fundus image photoelectrically changed by the television camera 30 is stored in the frame memory 41, and is processed by the CPU 43 via the interface 42 as necessary. The original image and the calculation result are stored in a mass storage 45 as an external storage device. Is stored. The mass storage 45 is configured by, for example, an information recording device such as a magnetic disk device or an optical disk device.
The fundus image and the data related to the fundus image stored in the mass storage 45 can be reproduced on the television monitor 50 again via the interface 42, the CPU 43, and the frame memory 41.

When the imaging of the subject's eye is completed,
The reticle / glass plate driving unit 80 and the quick return mirror driving unit 16a operate, the reticle 17 is inserted into the optical path 1 of the imaging optical system 10, the quick return mirror 16 rises, and returns to the state at the time of observation.

When the photographing mode is set by the mode setting unit 44 and the trigger switch 22b, which is a photographing switch, is turned on, an ON signal of the trigger switch 22b is input to the CPU 43, and the quick return mirror driving unit 16a operates to operate the quick return mirror 16b. Descends, and the flash tube 22 emits light. The fundus image obtained by the emission of the flash tube 22 is guided to the imaging optical system 10 and forms an image on the film 61 of the film camera 60 via the imaging lens system 15. The shutter of the film camera 60 is opened and closed based on a signal from the CPU 43. The film 61 is usually a 35 mm film, but can be replaced with a Polaroid film (trademark) or the like as needed. When a Polaroid film is used, the image size is changed by a relay lens or the like.

FIGS. 3 and 4 show the glass plate 70 as a focus position correcting means for correcting the shift between the focus position of infrared light passing through the optical path 1 of the imaging optical system 10 and the focus position of visible light. The effect is shown. In the present embodiment, the correction of the in-focus position and the elimination of the alignment index image are simultaneously performed by mechanical movement.

That is, the glass plate 70 is formed of a parallel flat plate,
The end of 70 and the end of reticle 17 are joined. The glass plate 70 and the reticle 17 are moved forward and backward in the direction traversing the optical path l, thereby simultaneously correcting the shift of the focus position and invalidating the alignment index image. Drives the glass plate 70 and the reticle 17 forward and backward.

Fig. 3 shows the focusing position of infrared light IR when there is no glass plate 70
And shows a deviation between the A ₁ and focus position A ₂ of the visible light R, the subject's eye image of the visible light V that has transmitted through the imaging lens system 15 and the relay lens system 19, the infrared light IR multiplexer imaging from focus position a ₁ to the focus position a ₂ close to the relay lens system 19 but, as shown in Figure 4, inserting the glass plate 70 on the optical path l, focusing visible light V position a ₂ the deviation between the position a _1, a ₂ focus coincides with the position a ₁ focusing infrared light IR is corrected. As a result, an eye image of the visible light V is formed on the light receiving surface of the television camera 30 in the same manner as the infrared light IR eye image.

FIG. 5 shows an embodiment in which the glass plate 70 and the reticle 17 are integrally formed. In this example, the glass plate 70 and the reticle 17 are integrally provided in an “L” shape. I have. A rotating shaft part is provided at the joint between the glass plate 70 and the reticle 17.
A reticle / glass plate driving section 80 is provided so that the reticle / glass plate driving section 80 rotates the glass plate 70 and the reticle 17 integrally to correct the shift of the focus position and invalidate the alignment index image. Has become.

As a method for correcting the deviation between the focus position of the eye image to be inspected by infrared light IR and the focus position of the eye image to be inspected by visible light V, in addition to the above, a lens is inserted instead of the glass plate 70. Perforated mirror 12 using a piezo element or solenoid
The following method may be used to move any of the lenses or the light receiving surface of the television camera 30, or to perform focus adjustment using any of the lenses from the perforated mirror 12 to the television camera 30 as a liquid crystal lens.

FIG. 6 shows a case in which a pattern 17a for forming an alignment index using liquid crystal is formed on the reticle 17 as index image eliminating means. In this case, during observation, the controller 40
The reticle pattern 17a is formed by the command signal of (1), and the reticle pattern 17a is eliminated in the television camera shooting mode. By doing so, the alignment index can be eliminated by the electrical operation of the controller 40 based on the designation of the shooting mode, and the configuration of the fundus camera 1 can be simplified.

As shown in FIG. 7, the reticle pattern may be constituted by an infrared reflecting mirror that reflects infrared light for alignment adjustment but transmits light at the time of image input, as shown in FIG. . With this configuration, the eye image of the infrared light to be inspected is reflected by the infrared light reflecting mirror portion having a desired shape, and the visible light passes through the infrared light reflecting mirror, so that a desired reticle pattern can be formed at the time of observation. Thus, it is not necessary to operate the reticle 17 with a signal from the controller 40 only to eliminate the alignment index.

(Effects of the Invention) The present invention provides an imaging method in which, when observing the subject's eye, the subject's eye image of infrared light obtained by irradiating the subject's eye with infrared light at the time of observing the subject's eye is projected on a photoelectric conversion device and photographed. An optical system, and at the time of observation of the eye to be examined, in an ophthalmic examination apparatus having a display unit for displaying the image of the eye to be inspected of infrared light as a visible image by a signal from the photoelectric conversion device, irradiating the eye to be examined with visible light At the time of photographing the eye to be examined to project and photograph the image of the eye to be obtained by the photoelectric conversion device through the imaging optical system,
A recording unit capable of recording the image of the subject's eye projected on the photoelectric conversion device as an electronic image, and a recording unit provided in the imaging optical system, the infrared light projected on the photoelectric conversion device when the subject's eye is photographed. Focus position correcting means for correcting the shift of each focal position between the subject's eye image and the visible eye's subject image. Since the photoelectric conversion device (television camera) used for observing the ophthalmologic examination device can be shared during photographing, the ophthalmologic examination device can be improved in the photographing function and the focus caused by the difference in wavelength between visible light and infrared light can be improved. The problem of displacement can be solved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a fundus camera according to an embodiment of the present invention,
FIG. 2 is a block diagram showing the configuration of the controller of the fundus camera of FIG. 1, and FIG. 3 is a focusing position of infrared light and a focusing of visible light in the optical path of the imaging optical system of the first embodiment. FIG. 4 is an explanatory view showing a deviation from the position, FIG. 4 is an explanatory view showing a state where the focus position of visible light when a glass plate is inserted into the optical path in FIG. 3 is corrected, and FIG. 5 is a first embodiment. FIG. 6 is a diagram showing another configuration of the in-focus position correcting unit and the index image canceling unit of the example, FIG. 6 is a diagram showing another configuration of the index image canceling unit of the first embodiment of the present invention, and FIG. FIG. 4 is a diagram showing the reflection characteristics of an infrared light reflecting mirror of the index image eliminating means. DESCRIPTION OF SYMBOLS 1 ... Fundus camera 2 ... Eye 10 to be examined 10 ... Imaging optical system 20 ... Illumination optical system 30 ... TV camera (photoelectric conversion device) 40 ... Controller (storage unit) 50 ... TV monitor (display unit) 60 …… Film camera 70 …… Glass plate (focus position correcting means) 80 …… Index image eliminating means

Claims (1)

(57) [Claims] 1. An imaging optical system for projecting an infrared light eye image obtained by irradiating infrared light to an eye to be inspected onto a photoelectric conversion device during observation of the eye to be inspected, and for photographing the eye to be inspected. An ophthalmologic examination apparatus having a display unit that displays the eye image of the infrared light as a visible image by a signal from the photoelectric conversion device, wherein the image of the eye to be inspected obtained by irradiating the eye to be inspected with visible light is A recording unit capable of recording, as an electronic image, the image of the subject's eye projected on the photoelectric conversion device when the subject's eye is photographed by projecting the image on the photoelectric conversion device via an imaging optical system; and the imaging optical system. Focusing position correction means for correcting the shift of each focal position between the infrared light subject eye image and the visible light subject eye image projected on the photoelectric conversion device at the time of photographing the subject eye, An ophthalmologic examination apparatus comprising: