JPH04226625A - Ophthalmologic device - Google Patents

Abstract

PURPOSE:To execute focusing on the same image pickup plane by a near IR luminous flux or visible luminous flux without operating the attachment and detachment, etc., of an optical member for an image pickup optical system. CONSTITUTION:The visible luminous flux or near IR luminous flux emitted from a light source 1 for observation of the eyeground advances on an optical path 01 and arrives at the eye E to be examined and is reflected by the retina VS or the choroid IR deeper than the retina. This reflected luminous flux returns in the same optical path, advances in an optical path 02 through the aperture of a bored mirror 7, is reflected by a quick return mirror 11 and is made incident on an optical path correcting lens 13. The reflection planes vary at the point of this time and, therefore, the position of the imaging plane VS' or IR' of the reflected luminous flux deviates but the focus is corrected by the optical path correcting lens 13.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmological apparatus such as a fundus camera used, for example, in an ophthalmological clinic.

0002

2. Description of the Related Art Some conventional fundus cameras are known that share the functions of both a mydriatic fundus camera and a non-mydriatic fundus camera. Generally, in a fundus camera, a light flux is incident on the subject's eye, and the reflected light flux of the fundus is received by the photographing surface of the imaging optical system. The visible light flux used by the camera is separated in wavelength, so when it enters the subject's eye, the visible light flux is reflected by the retina, but the near-infrared light flux is reflected by the choroid, which is a layer deeper than the retina, and is reflected by the fundus of both eyes. The focus position of the image shifts. Therefore, for example, the photographing optical system used for observation and photographing without mydriasis.
When the imaging plane is also used for mydriatic fluorescence photography, it is necessary to correct the shift in focal position.
As disclosed in Japanese Patent No. 636, a removable optical path correction member is provided in the photographing optical system, and a focused fundus image is obtained by inserting and removing the optical path correction member depending on the used light beam.

0003

However, in the conventional example described above, the focus shift is corrected by inserting and removing the optical path correction member, which has the disadvantage that the operation is troublesome and there is a risk of forgetting to insert and remove it. ing.

[0004] An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional example, and to photograph fundus images on the same imaging surface using near-infrared light beams or visible light beams without performing operations such as inserting and removing optical members. The objective is to provide an ophthalmological device that makes it possible to

[0005]

[Means for Solving the Problems] An ophthalmological apparatus according to the present invention for achieving the above object includes an illumination optical system that illuminates the fundus of an eye to be examined with a near-infrared light flux or a visible light flux, and the near-infrared light flux. Alternatively, focus correction is performed on the fundus-reflected light beam of the visible light beam on the same optical path so that the imaging plane of the fundus-reflected light beam of the near-infrared light beam and the image-formation plane of the fundus-reflected light beam of the visible light beam coincide. and an imaging optical system that guides the light to the imaging surface after the imaging.

[0006]

[Operation] The ophthalmological device having the above configuration illuminates the fundus of the choroid with near-infrared light flux or visible light flux, and the imaging plane of near-infrared light flux and fundus-reflected light flux and the imaging plane of visible light flux and fundus-reflected light flux are After performing focus correction on the same optical path so that they match, the light is guided to the same imaging surface.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail based on the illustrated embodiments. FIG. 1 shows a configuration diagram of an embodiment. On the optical path 01 from a continuously lit fundus observation light source 1 such as a halogen lamp that emits a luminous flux containing visible and near-infrared components to the eye E, there is a filter. 2, a lens 3, a photography strobe light source 4 that emits visible light flux, a filter 5, a lens 6, a perforated mirror 7, an objective lens 8 arranged conjugately to the retina VS of the eye E to be examined; On the optical path 02, there is a filter 9, a lens 10, and a flip-up mirror 1 that can be inserted into and removed from the optical path.
1. A film 12 is disposed, and on the optical path 03 in the reflection direction of the flip-up mirror 11, an optical path correction lens 13 and a television camera 14 sensitive to near-infrared light flux and visible light flux are disposed, and the output of the television camera 14 is disposed. is connected to a television monitor 15 and an image recording means 16. Note that the filter 2 includes a visible light transmitting filter 2a that blocks near-infrared light flux;
It is composed of a near-infrared light transmitting filter 2b that blocks visible light beams, and both can be selectively inserted into and removed from the optical path 01. The filter 5 is composed of a visible fluorescence excitation filter 5a and an infrared fluorescence excitation filter 5b, both of which are connected to the optical path 0.
The filter 9 is made up of a visible fluorescence filtration filter 9a and an infrared fluorescence filtration filter 9b.
Both can be inserted into and removed from the optical path 02. Further, the optical path correction lens 13 is designed to make the imaging surface of the television camera 14 conjugate with the retina VS for visible light beams and conjugate with the choroid IR for near-infrared light beams.

The near-infrared light flux and the visible light flux emitted from the fundus observation light source 1 travel on the optical path 01, pass through the filter 2, lens 3, filter 5, and lens 6, and are reflected by the perforated mirror 7, and then pass through the objective lens. 8, the light reaches the eye E to be examined and illuminates the fundus of the eye. Then, the visible light flux is reflected by the retina VS, and the near-infrared light flux is reflected near the choroid IR and returns along the same optical path. Furthermore, the aperture of the perforated mirror 7, the filter 9, and the lens 10
When the flip-up mirror 11 is removed from the optical path 02, a fundus image is formed on the film 12, and when the flip-up mirror 11 is inserted onto the optical path 02,
It is reflected by the flip-up mirror 11, and the optical path correction lens 1
3, a fundus image is formed on the television camera 14, and the fundus image is displayed on the television monitor 15 as an image electrical signal or is video recorded on the image recording means 16.

[0009] Here, as mentioned earlier, the visible light flux
S, the near-infrared light beams are each reflected by the choroid IR, so the positions of their imaging planes VS' and IR' are different before entering the optical path correction lens 13 as shown in FIG. The optical path length is corrected by the lens 13, and both fundus images are focused and formed on the television camera 14 to obtain a clear image.

The specific operating procedure at the time of measurement will be described below. During mydriatic photography, a viewing light transmission filter 2a is placed on the optical path O1.
The fundus observation light source 1 is turned on with the flip-up mirror 11 inserted on the optical path O2, the fundus is illuminated with a visible light flux, a retinal image is formed on the television camera 14, and the retinal image is output to the television monitor 15. After observation and alignment, the photographing strobe light source 4 is emitted, the flip-up mirror 11 is moved, and the retinal image is guided to the film 12 or television camera 14 for photographing.

During non-mydriatic photography without using a mydriatic agent, the light source 1 for fundus observation is inserted with the near-infrared light transmitting filter 2b inserted on the optical path O1 and the flip-up mirror 11 inserted on the optical path O2.
is turned on, the fundus is illuminated with near-infrared light flux, a choroidal image is formed on the television camera 14 and outputted to the television monitor 15, and after observation and alignment, the photography strobe light source 4 is emitted. The flip-up mirror 11 is moved to form an image of the fundus on a film 12 or a television camera 14 and photographed.

When photographing visible fluorescence, the visible light transmission filter 2
a. Insert the visible fluorescence excitation filter 5a on the optical path to form a retinal image on the television camera 14, output it to the television monitor 15 for observation and alignment, and then insert the visible fluorescence filtration filter 9a on the optical path 02. Then, TV camera 14
, a moving image is recorded by the image recording means 16, or the flip-up mirror 11 is moved to guide light onto the film 12 for film photography.

On the other hand, during infrared fluorescence photography, a near-infrared transmission filter 2b and an infrared fluorescence excitation filter 5b are placed on the optical path.
A flip-up mirror 11 is inserted into the optical path O2, and a choroidal image of the fundus is formed on a television camera 14, outputted to a television monitor 15, and after observation and alignment are performed, a moving image is recorded by an image recording means 16. conduct.

The present invention can also be applied to a fundus camera that does not perform fluorescence photography, and an optical viewfinder may be removably installed on the optical path 03 of the photographing optical system. In addition, instead of performing correction only with the optical path correction lens 13, the objective lens 8
, the lens 10 may be combined to have the correction function as described above.

[0015]

Effects of the Invention As explained above, the ophthalmological device according to the present invention illuminates the fundus with near-infrared light flux or visible light flux,
The near-infrared light flux is guided to the imaging plane after focus correction is performed within the same optical path so that the imaging plane of the near-infrared light flux and the fundus-reflected light flux coincide with the imaging plane of the visible light flux and the fundus-reflected light flux. It is possible to perform focusing on the same imaging surface using external light flux or visible light flux without performing operations such as insertion and removal of optical members for the imaging optical system.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram.

[Explanation of symbols] 1. Light source for fundus observation 2, 5, 9 filter 4 Strobe light source for photography 11 Flip-up mirror 12 Film 13 Optical path correction lens 14 TV camera 15 TV monitor 16 Image recording means

Claims (1)

[Claims] 1. An illumination optical system that illuminates the fundus of an eye to be examined with a near-infrared light flux or a visible light flux; An ophthalmology clinic comprising: an imaging optical system that guides light to an imaging plane after performing focus correction on the same optical path so that the imaging plane and the imaging plane of the fundus-reflected light flux of the visible light flux coincide with each other. Device.