Eye fundus photographic device for examining gaze properties

Abstract

The invention provides a fundus photographic device used for checking the watching property, and belongs to the technical field of checking the watching property of fundus of amblyopia patients, and the fundus photographic device comprises a lighting system which comprises a diaphragm, and a checking icon used for checking the watching property is designed on the surface of the diaphragm; the light path axis of the observation system is fixed on one side slightly deviating from the illumination light path axis of the illumination system; wherein the illumination system is used for illuminating the fundus of an examined person and projecting the fixation property diaphragm to the fundus, an observer can conveniently observe and judge the fixation property of the fundus through the observation system, and the fixation property examination diaphragm is installed on the fundus camera so that a fundus photo with the visible fixation property can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of examination of the fundus fixation nature of amblyopia patients, and particularly relates to a fundus photography device for examining the fixation nature. Background Art

[0002] The examination of the fixation nature is very important for amblyopia patients. Amblyopia usually has two fixation natures: central fixation and eccentric fixation. For amblyopia patients with eccentric fixation, it is necessary to treat their amblyopia nature first, otherwise the amblyopia treatment will not be effective. However, the examination of the fixation nature requires relatively high skills for doctors. The previous fixation nature examination instrument was a direct ophthalmoscope. During the examination, the sound eye of the patient was covered, and the fundus of the patient was examined with a direct ophthalmoscope. The patient was asked to directly fixate on the black dot in the ophthalmoscope, and the examiner observed the position of the fovea centralis and the examination diaphragm to judge the fixation nature. If the fovea centralis was within the 1° light ring of the fixation nature examination diaphragm, it was central fixation, otherwise it was eccentric fixation.

[0003] The above examination has some defects: (1) It has high requirements for patients. The fundus mirror examination takes a long time, and the patient needs to continuously fixate on the black dot in the fundus mirror. It is very difficult to accurately examine children patients who are younger and less cooperative. (2) It has relatively high requirements for the examiner. First, the examiner needs to learn to use a direct ophthalmoscope to examine the fundus. It is more difficult to examine the fundus of patients with small pupils with a direct fundus mirror. (3) The examination result is only visible to the examiner under the ophthalmoscope, and the patient cannot directly see the examination result, which is less persuasive to the patient. Summary of the Invention

[0004] The object of the present invention is to overcome the problem in the above background art that the examination result is only visible to the examiner under the ophthalmoscope, and the patient cannot directly see the examination result, which is less persuasive to the patient.

[0005] Based on the above technical idea, the technical solution adopted by the present invention is as follows: A fundus photography device for examining the fixation nature, comprising: An illumination system, including a diaphragm, and an examination icon for the fixation nature is designed on the surface of the diaphragm; An observation system, and the optical axis of the observation system is fixed on one side slightly offset from the illumination optical axis of the illumination system; Wherein, the illumination system is used to illuminate the fundus of the examinee and project the fixation nature diaphragm onto the fundus, and the observation system facilitates the observer to observe and judge the fundus fixation nature.

[0006] For further limitation of the above technical solution, the lighting system further includes a tungsten filament lamp and a flash lamp, and the tungsten filament lamp and the flash lamp are arranged at a right angle. First condenser lenses are provided on the irradiation paths of both the tungsten filament lamp and the flash lamp. A beam splitter is provided at the confluence of the light rays of the tungsten filament lamp and the flash lamp. A photosensitive filter and a first reflecting mirror are also provided on the irradiation paths of the tungsten filament lamp and the flash lamp, and the photosensitive filter and the first reflecting mirror are sequentially located at the rear side of the beam splitter. A diaphragm and a semi-transmissive semi-reflective mirror are sequentially provided in the vertical direction above the first reflecting mirror. A second condenser lens is provided in the horizontal light reflection direction of the semi-transmissive semi-reflective mirror, and the light rays will converge on the retina of the examinee through the second condenser lens.

[0007] For further limitation of the above technical solution, the observation system includes a second condenser lens. A third condenser lens, a movable reflecting mirror and a film are sequentially provided in the horizontal direction on the side of the second condenser lens away from the retina. The movable reflecting mirror can rotate around the left side to realize the switching of the imaging and observation lines. A fixed reflecting mirror is provided in the vertical direction of the movable reflecting mirror, and an eyepiece assembly is provided in the horizontal light reflection direction of the fixed reflecting mirror.

[0008] For further limitation of the above technical solution, the icon on the surface of the diaphragm is three concentric circles and a black dot located at the center. Four groups of scale lines arranged in a 90° array along the center of the circle are also provided on the surface of the icon on the diaphragm surface.

[0009] For further limitation of the above technical solution, the second condenser lens in the observation system and the second condenser lens in the lighting system are the same lens.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: This application can examine the fixation nature of patients through fundus photography. By installing a diaphragm on the existing fundus camera system, the diaphragm spot is projected onto the retina of the examined eye, enabling the patient to fixate by looking at the center of the diaphragm spot image. At this time, fundus photography is performed, and the doctor can judge the fixation nature by observing the position of the fovea centralis and the spot in the fundus photograph of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is the optical path diagram of the fundus photography device of the present invention; Figure 2 It is the principle optical path diagram of the beam splitter of the present invention; Figure 3 Schematic diagram of the diaphragm surface structure of the present invention; Figure 4 Schematic diagram of the diaphragm of the present invention projected onto the retina Figure 1 ; Figure 5 Schematic diagram of the diaphragm of the present invention projected onto the retina Figure 2 ; Figure 6 Schematic diagram of the diaphragm of the present invention projected onto the retina Figure 3 ; Figure 7 Schematic diagram of the diaphragm of the present invention projected onto the retina Figure 4 .

[0013] Wherein, 1, tungsten filament lamp; 2, flash lamp; 3, first condenser lens; 4, beam splitter; 5, photosensitive filter; 6, first reflecting mirror; 7, diaphragm; 8, semi-transparent and semi-reflective mirror; 9, second condenser lens; 10, third condenser lens; 11, movable reflecting mirror; 12, fundus color photograph; 13, fixed reflecting mirror; 14, eyepiece assembly. Detailed implementation manners

[0014] The following further describes the present invention in detail with reference to the Figures 1-7 accompanying drawings.

[0015] Embodiment 1: This embodiment provides a fundus photography device for examining the nature of fixation. As Figure 1 shown, it can solve the problem that the inspection result is only visible to the examiner under the ophthalmoscope, and the patient cannot intuitively see the inspection result, resulting in poor persuasion for the patient. It includes, an illumination system, including a diaphragm 7, and the surface of the diaphragm 7 is designed with an inspection icon for the nature of fixation; an observation system, and the optical axis of the observation system is fixed on one side slightly offset from the illumination optical axis of the illumination system; wherein, the illumination system is used to illuminate the fundus of the examined person and project the fixation diaphragm onto the fundus, and the observation system facilitates the observer to observe and judge the nature of fixation of the fundus.

[0016] Combined with Figure 1 and Figure 2, in an embodiment of the present invention, the lighting system further includes a tungsten filament lamp 1 and a flash lamp 2, and the tungsten filament lamp 1 and the flash lamp 2 are arranged at a right angle. A first condenser lens 3 is provided on the irradiation paths of both the tungsten filament lamp 1 and the flash lamp 2. A beam splitter 4 is provided at the confluence of the light rays of the tungsten filament lamp 1 and the flash lamp 2. A photosensitive filter 5 and a first reflecting mirror 6 are also provided on the irradiation paths of the tungsten filament lamp 1 and the flash lamp 2, and the photosensitive filter 5 and the first reflecting mirror 6 are sequentially located behind the beam splitter 4. Above the first reflecting mirror 6, a diaphragm 7 and a semi-transmissive semi-reflective mirror 8 are sequentially arranged in the vertical direction. The surface of the diaphragm 7 is marked with three concentric circles and a black dot at the center. On the surface of the icon of the diaphragm 7, there are also 4 groups of marking lines arranged in a 90° array along the center of the circle (as Figure 3 shown). A second condenser lens 9 is provided in the horizontal light reflection direction of the semi-transmissive semi-reflective mirror 8. Through the second condenser lens 9, the light rays will converge on the retina of the examinee.

[0017] Based on the above features, the specific working principle of this embodiment is: The tungsten filament lamp 1 and the flash lamp 2 are used as light sources. The tungsten filament lamp 1 is used for fundus illumination during focusing, and the flash lamp 2 is used to instantaneously increase the intensity of fundus photography to a certain level for shooting. The condenser lens 3 converts the light emitted by the light sources (i.e., the tungsten filament lamp 1 and the flash lamp 2) into parallel light rays. The beam splitter 4 can make the two lighting light sources designed on the same optical axis (see Figure 2 in the attached drawings of the specification). The photosensitive filter 5 performs filtering on the light rays. The processed light rays are reflected by the first reflecting mirror 6. The reflected light rays pass through the diaphragm 7 and are reflected twice by the semi-transmissive semi-reflective mirror 8. The reflected light rays pass through the second condenser lens 9, and through the second condenser lens 9, the light rays will converge on the retina.

[0018] Combined with Figure 1 , in an embodiment of the present invention, the observation system includes a second condenser lens 9. In the horizontal direction on the side of the second condenser lens 9 away from the retina, a third condenser lens 10, a movable reflecting mirror 11, and a film 12 are sequentially arranged. The movable reflecting mirror 11 can rotate around the left side to realize the switching of the imaging and observation lines. A fixed reflecting mirror 13 is provided in the vertical direction of the movable reflecting mirror 11. An eyepiece assembly 14 is provided in the horizontal light reflection direction of the fixed reflecting mirror 13.

[0019] Based on the above features, the specific working principle of this embodiment is: Adjust the movable reflecting mirror 11 to the horizontal state. The optical axis of the observation system is fixed on one side slightly offset from the optical axis of the illumination system. The second condenser lens 9 in the observation system and the second condenser lens 9 in the illumination system are the same lens. The third condenser lens 10 is another lens in the observation system. The fundus image of the combined fundus fixation property examination that is illuminated passes through the second condenser lens 9 and the third condenser lens 10 and then converges on the film 12 to form a fundus color photo (see the attached Figure 1), adjust the movable mirror 11 to an inclined state. The light passes through the movable mirror 11 and the fixed mirror 13 and reaches the eyepiece assembly 14, and finally the light enters the observer's eye (see the appendix Figure 1 ).

[0020] According to the positional relationship between the concentric circle center mark projected onto the retina and the fovea centralis of the macula, it is divided into: Fovea centralis fixation of the macula (as Figure 4 shown); Parafoveal fixation: The fovea centralis is within the 3° ring (as Figure 5 shown); Paramacular fixation: between the 3° ring and the 5° ring (as Figure 6 shown); Peripheral fixation: between the marginal part of the macula and the optic disc (as Figure 7 shown).

[0021] This can facilitate the patient to intuitively understand the positional relationship of the fovea centralis of their own retina.

[0022] The above content is a further detailed description of the present invention in combination with specific preferred implementation schemes, which is convenient for those skilled in the art of this technology to understand and apply the present invention. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions.

Claims

1. A fundus photography device for examining gaze properties, characterized in that: include An illumination system including an aperture with inspection icons on the aperture surface for observing properties; An observation system, wherein the optical path axis of the observation system is fixed to one side slightly biased from the illumination optical path axis of the illumination system; The lighting system is used to illuminate the fundus of the person being examined and project a gaze property aperture onto the fundus, and the observation system facilitates the observer to observe and judge the gaze property of the fundus.

2. The fundus photography device for checking gaze properties according to claim 1, characterized in that: The lighting system also includes a tungsten lamp and a flash, and the tungsten lamp and the flash are arranged at right angles, a first focusing lens is arranged on the irradiation path of the tungsten lamp and the flash, a beam splitter is arranged at the confluence of the light of the tungsten lamp and the flash, a photosensitive filter and a first reflecting mirror are also arranged on the irradiation path of the tungsten lamp and the flash, and the photosensitive filter and the first reflecting mirror are successively located on the rear side of the beam splitter, an aperture and a semi-transparent and semi-reflective mirror are successively arranged in the vertical direction above the first reflecting mirror, a second focusing lens is arranged in the horizontal light reflection direction of the semi-transparent and semi-reflective mirror, and the light passing through the second focusing lens will converge on the retina of the examinee.

3. The fundus photography device for checking gaze properties according to claim 2, characterized in that: The observation system includes a second condensing lens, and a third condensing lens, a movable reflector and a film are sequentially arranged in the horizontal direction of the second condensing lens away from the retina. The movable reflector can rotate around the left side to realize the switching of imaging and observation lines. A fixed reflector is arranged in the vertical direction of the movable reflector, and an eyepiece combination is arranged in the horizontal light reflection direction of the fixed reflector.

4. The fundus photography device for checking gaze properties according to claim 1, characterized in that: The aperture surface icon is three concentric circles and a black dot in the center. The aperture surface icon surface is also provided with four groups of marking lines arranged in a 90° array along the center of the circle.

5. The fundus photography device for checking gaze properties according to claim 3, characterized in that: The second condensing lens in the observation system and the second condensing lens in the illumination system are the same lens.

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