JPH042328A - Eye ground camera - Google Patents

Abstract

PURPOSE:To ensure a wider eye ground field of view frame by displaying an eye ground image of an eye to be examined and information necessary for observation and photographing in the same field of view while they are removed or displayed easily to eliminate addition of a field of view for presentation of information. CONSTITUTION:An eye ground camera comprises a lighting system, an observation photographing system B, a focusing system C and a detection system F. First, a lift mirror 14 is placed at a position within a luminous flux and a lift mirror 202 is placed at a lifting position to light a light source 2 for observation so that an eye ground E is illuminated. Moreover, an indicator light source 40 is lit. Then, condition of two indicator images on the eye ground E is judged by an eye of an inspector a focussing with the two images in parallel or a non-focussing with the two images separating from each other. When the focussing is determined, a focussing lens 12 is moved to focus. Then, desired information is shown on a display device 30 by selection with a display selection switch 224 and the lift mirror 202 is placed within the luminous flux to be observed by the eye of the inspector. A lift mirror 14 is placed at a lifting position and a light source 4 for photographing is lit to take a photograph of the eye ground.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a fundus that allows display of information necessary for observing or photographing the fundus at the same time as the fundus image when observing the fundus of the eye to be examined. Regarding the camera.

[Prior Art] A conventional fundus camera projects an alignment index toward the cornea of the eye to be examined, and the image reflected from the cornea of the index is superimposed on the fundus image for observation. A device is known in which camera alignment can be performed prior to photographing a fundus image.

In addition, a data display field frame that displays information necessary for observation, such as the subject's name and the name of the intraocular disease, and information necessary for imaging, such as the emission time of the bovine senon lamp for fluorescence photography, is attached to the fundus image. It is known that the main image display field frame is placed side by side within the same field of view as the main image display field frame, so that both can be observed at the same time.

[Problem to be solved by the invention]

In a type of fundus camera that superimposes an alignment index image on a fundus image for observation, there is a problem in that the portion of the fundus image that overlaps with the alignment index image cannot be observed with sufficient precision.

In addition, in a type of fundus camera in which the field frame for displaying data can be observed side by side with the field frame for displaying the main image that captures the fundus image within the same field of view, the field frame for data display has a difference between the field frame for displaying the main image and the field frame for displaying the main image. The size will be limited. Therefore, in order to observe the fundus image with high precision, there has been a problem in that it is necessary to magnify the desired observation area using a variable magnification optical system provided in the fundus camera.

The present invention has been made in view of the above-mentioned problems, and allows the fundus image of the eye to be examined and information regarding observation or photography to be observed within the same field of view during medical examination, and allows them to be easily interchanged. It is an object of the present invention to provide a fundus camera configured to have a sufficiently wide observation field frame.

[Means for Solving the Problems] The present invention that achieves the above object includes an illumination system that illuminates the fundus of the eye to be examined, and an imaging optical system and a combination of the fundus image formed by the light reflected from the fundus of the eye to be examined. an imaging system for photographing via a focusing optical system; and a first optical system branched from the optical path of the imaging system.
In a fundus camera having a secondary optical path and an observation system for observing a fundus image formed on an observation surface via an imaging optical system and a focusing optical system, the focusing optical system and the imaging optical system are a first light splitting member disposed between the two; and information for observation or photography provided on a second sub-light path branched by the first light splitting member and provided at a position conjugate with the observation surface. This fundus camera is characterized in that it has a display means for displaying a fundus image of the eye to be examined and the information regarding the observation or photographing described above can be observed within the same field of view.

Furthermore, the present invention includes an illumination system that illuminates the fundus of the eye to be examined;
A photographing system for photographing a fundus image formed by light reflected from the fundus of the eye to be examined via an imaging optical system and a focusing optical system, and a first sub-light path branched from the optical path of the photographing system. A fundus camera having an observation system for observing a fundus image formed on an observation surface via an imaging optical system and a focusing optical system, disposed between the focusing optical system and the imaging optical system. displaying information on the first light splitting member that has been split and an observation or photographing fence that is disposed on a second sub-light path branched by the first light splitting member and that is located at a position conjugate with the observation plane. A display means, and a detection means arranged on a third sub-light path branched from the first sub-light path for detecting a focusing state or an alignment state of the eye to be examined, and displaying a fundus image of the eye to be examined and a fundus image of the eye to be examined. This fundus camera is characterized in that it is configured so that information regarding a focus state or an alignment state can be observed within the same field of view.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings. The fundus camera of the embodiment is composed of an illumination system A, an observation and photographing system B, a focusing system C1, a display system, and a detection system F, as shown in FIG.

The illumination system A is for illuminating the fundus Er of the eye E to be examined. The illumination system A includes a concave reflector 1 arranged in order on the optical axis 0□, an observation light source 2 such as a halogen lamp, a condenser lens 3, a photography light source 4 such as a xenon lamp, a condenser lens 5, and a ring-shaped aperture. Aperture 6, optical axis 01
A reflecting mirror 7, a relay lens 8, a relay lens 9, and a perforated mirror 10 having a hole 10a are arranged in order on an optical axis 02 obliquely intersecting with the optical axis 02. It consists of an objective lens 11 facing the eye E to be examined. A diagonal half mirror 200 is arranged between the relay lenses 8.9 on the optical axis 02 to introduce the light beam from the focusing system C into the illumination system.

The ring-shaped aperture diaphragm 6, which is uniformly illuminated by the observation light source 2 and the photographing light source 4, is connected to the perforated mirror 10 with respect to the optical system consisting of the reflecting mirror 7 and the relay lens 8.9.
It has a conjugate relationship with the hole 10a. Also, perforated mirror 1
The hole 10a of 0 is in a conjugate relationship with the anterior segment Ep of the eye E to be examined with respect to the objective lens 11. Therefore, the ring-shaped aperture stop 6 and the anterior segment Ep of the eye E to be examined are in an optically conjugate relationship.

The observation and photographing system B for observing and photographing the fundus Er is related to the first sub-light path S1, and includes an objective lens 11, a focusing lens 12, and an imaging lens 13 arranged in this order on the optical axis 03.
, a flip-up mirror 14 and a film 18. The observation and photographing system B further faces the reflection optical axis ○ of the flip-up mirror 14 that is not flipped up, the filled lens 15, the half-reflection prism 16, and the examiner's eye P, which are arranged in this order above. It has an eyepiece lens 17.

A flip-up mirror 202 is provided between the focusing lens 12 and the imaging lens 13 to introduce the light beam from the display system into the imaging observation system B.

The focusing system C includes, on the optical axis 06, an index light source 40, a condenser lens 42, and a slit-shaped index 46 with a deflection prism 44.
, a relay lens 48, a two-hole aperture 50, and the above-mentioned oblique half mirror 200. The index light source 40 is arranged at the four cancer control point positions of the condenser lens 42, and the light beam passing through the condenser lens 42 becomes a parallel light beam.

The deflection prism 44 is formed by arranging a pair of identical prisms symmetrically facing each other with the optical axis 06 as the center.

As shown in FIG.
A vertical slit 52 is provided at the center. The slit-like index 46 includes a relay lens 48, a relay lens 9,
Regarding the objective lens 11, it is conjugate with the fundus Er. As shown in FIG. 3, the two-hole diaphragm 50 has small circular holes 60 and 62 located at horizontally symmetrical positions with respect to the optical axis 06. The two-hole aperture 50 is conjugate with the anterior segment Ep of the relay lens 9 and the objective lens 11.

Of the focusing system C, an index light source 40 surrounded by a dotted line in FIG.
The condenser lens 42, the slit index 46, the relay lens 48, and the two-hole diaphragm 50 move together with the focusing lens 12 on the 06 for focusing.

The display system is related to the second sub-optical path S2, and the optical axis 0
5, a display 30, an imaging lens 32, an oblique mirror 34
, consisting of the flip-up mirror 202 described above. The display 30 is conjugate with the film 18 with respect to the imaging lens 32 and the imaging lens 13 . The display 30 displays the elapsed time after the administration of the fluorescent agent during fluorescence photography, the photography mode, the focusing state, the alignment state, and the like.

The detection system F is related to the third sub-light path S3, and is located on the transmission optical axis 07 of the half-reflection prism 16 of the observation and photographing system B.
An imaging lens 70 and a detector 72 are arranged. The detector 72 is connected to the imaging lens 70 and the field lens 15.
is conjugate to the focal plane of

The detector 72 detects the imaging state here and generates a goldfish signal or an alignment signal.

The output of the detector 72 is connected to the control section 220.

A timer 222 and a display selection switch 224 for selecting the display content of the display 30 are connected to the control B 220 . The output of the control section 220 is connected to the display 30.

In the above configuration, the flip-up mirror 14 is placed at the light flux position shown by the solid line in FIG.
Place it in the flip-up position shown by the dotted line in the figure.

The observation light source 2 is turned on to illuminate the fundus Er. moreover,
The indicator light source 40 is turned on. The examiner's eye P determines whether the two index images are juxtaposed in the fundus Er (in-focus state) or the two index images are separated and out-of-focus state. , and focuses by moving the focusing lens 12. This focusing state is detected by the detector 72.

The display 30 is selected by the display selection switch 224.
desired information, such as the shooting mode, is displayed on the screen, and the flip-up mirror 202 is placed at the light beam position shown by the solid line in FIG.
Observe with examiner's eye P.

The flip-up mirror 14 is placed in the flip-up position shown by the dotted line in FIG. 1, and the photographing light source 4 is turned on to photograph the fundus.

In other embodiments, visible light is used for the observation light source 2 and photography light source 4 for the illumination system, infrared light is used for the focusing system C, and visible light is used for the display system. Accordingly, the flip-up mirror 202 of the above embodiment can be made into a defined half mirror that reflects infrared light and transmits visible light, and the same effect can be obtained. However, in this embodiment, a half mirror 2 is installed obliquely on the optical axis of the infrared light of the index light source 40 of the focusing system C.
00 has the characteristics of reflecting infrared light and transmitting visible light, similar to the above-mentioned half mirror.

(Effects of the Invention) Since the present invention is configured as described above, the fundus image of the eye to be examined and the information necessary for observation or photography can be displayed within the same visual field frame, and they can be easily removed. It can be displayed. Further, since there is no need to juxtapose a visual field frame for presenting the above-mentioned information, a wide fundus visual field frame can be secured.

[Brief explanation of drawings]

FIG. 1 is an optical diagram of a fundus camera according to an embodiment of the present invention, FIG. 2 is a plan view of a slit-shaped index, and FIG. 3 is a plan view of a two-hole aperture. E...Eye to be examined Er...Fundus A...Illumination system B...Observation and photography system C... ...Focusing system D...Display system F...Detection system 11...Objective lens 12...Focusing Lens 16...Half reflective prism: 30...Indicator 46...Slit-shaped index 50...Two-hole aperture diagram

Claims (4)

[Claims] (1) An illumination system that illuminates the fundus of the eye to be examined; a photographing system that photographs the fundus image formed by light reflected from the fundus of the eye to be examined via an imaging optical system and a focusing optical system; A fundus camera having a first sub-light path branched from an optical path of an imaging system and an observation system for observing a fundus image formed on an observation surface via an imaging optical system and a focusing optical system,
a first light splitting member disposed between the focusing optical system and the imaging optical system; and a position located on a second sub-light path branched by the first light splitting member and conjugate with the observation plane. a display means for displaying information for observation or photography, which is provided in the eye, and is configured such that the fundus image of the eye to be examined and the information regarding the observation or photography can be observed within the same field of view. fundus camera. (2) an illumination system for illuminating the fundus of the eye to be examined; a photographing system for photographing the fundus image formed by light reflected from the fundus of the eye to be examined via an imaging optical system and a focusing optical system; A fundus camera having a first sub-light path branched from an optical path of an imaging system and an observation system for observing a fundus image formed on an observation surface via an imaging optical system and a focusing optical system,
a first light splitting member disposed between the focusing optical system and the imaging optical system; and a position located on a second sub-light path branched by the first light splitting member and conjugate with the observation plane. a display means for displaying information for observation or photographing, and a detection means for detecting the focusing state or alignment state of the eye to be examined, arranged on a third sub-light path branched from the first sub-light path. What is claimed is: 1. A fundus camera comprising: and a fundus camera configured to enable observation of a fundus image of an eye to be examined and information regarding a focusing state or alignment state of the eye to be examined within the same field of view. (3) A claim characterized in that the illumination light source for illuminating the fundus of the eye to be examined in the observation system is light in a first wavelength range, and the focused state and alignment state are light in a second wavelength range. The fundus camera according to item 2. (4) The fundus camera according to claim 3, wherein the light in the first wavelength range is visible light, and the light in the second wavelength range is infrared light.