System for eliminating eye ground camera stray light

Abstract

The invention provides a system for eliminating eye ground camera stray light. The system comprises an imaging subsystem and an illumination subsystem. The imaging system consists of a 1 / 4 wave plate, an eye objective lens, a polarized beam splitter prism and an imaging objective lens which are arranged in sequence. The illumination subsystem consists of an annular light source, a light uniformizing lens, a polarized beam splitter prism and an eye objective lens. After light emitted by the annular light source passes through the polarized beam splitter prism, linearly polarized light of vertical component is reflected, sequentially passes through the eye objective lens and the 1 / 4 wave plate and then enters the eyes of an observer, light reflected by the eye grounds of the eyes of the observer passes through the 1 / 4 wave plate and the eye objective lens and is transmitted into the imaging objective lens through the polarized beam splitter prism. After the polarized beam splitter prisms and the 1 / 4 wave plate are added into the system for eliminating the eye ground camera stray light, stray light of higher than 99.5%, produced by the eye objective lenses is eliminated, and stray light inhabitation effect is improved.

Description

technical field [0001] The invention relates to the technical field of medical fundus imaging, in particular to a system for eliminating stray light from a fundus camera. Background technique [0002] Stray light refers to all abnormal light that enters the imaging system and affects the imaging quality. For the design of the fundus camera, the stray light mainly comes from the backlight reflection of the cornea of ​​the eye. Due to the high reflectivity of the cornea, the backlight reflection of the cornea will introduce a lot of stray light to the imaging system. If good suppression measures cannot be taken, the imaging light reflected by the retina will be lost in the stray light, seriously affecting the imaging system. image quality. As shown in Figures 1a-1c, they are schematic diagrams of the reflection of incident light from the first position, the second position, and the third position of the cornea. The first position of the cornea is the critical state of the in...

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide users with a system for eliminating the stray light of the fundus camera, aiming at solving the problem of setting a black spot plate at a suitable position of the lighting system in the prior art to eliminate The backlight reflection of the eyepiece objective lens, the problem of complex calculation of the system

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