Fundus imaging eyepiece capable of being switched to wide angle/ultra-wide angle

Abstract

The invention discloses a fundus imaging eyepiece capable of being switched to a wide angle / an ultra-wide angle, the imaging eyepiece comprises two use modes, one mode is that a positive lens is used as an independently used eyepiece, and the other mode is that a negative lens is used as an independently used eyepiece; and the other mode is that a meniscus positive lens is placed between the positive lens and the imaged eyeball, the concave surface of the meniscus positive lens faces the eyeball, and the convex surface of the meniscus positive lens faces the positive lens. The eyepiece can achieve imaging in two different view ranges to adapt to different clinical application scenes, an original positive lens eyepiece can be used independently, an image mode with high resolution and high signal-to-noise ratio is achieved, and when the view range needs to be increased, the meniscus positive lens is cut into the space between the aspheric lens and the imaged eyeball; the combined eyepiece can be switched into a combined eyepiece with an ultra-large visual field, and can also be switched into an original eyepiece, so that high resolution and high signal-to-noise ratio required by most clinical application scenes are ensured, and a convenient anterior segment image inner switching mode is not damaged.

Description

technical field [0001] The invention relates to a fundus imaging eyepiece that can be switched to wide-angle / ultra-wide-angle. Background technique [0002] Fundus imaging examination is an important means of ophthalmological diagnosis. Common imaging methods include fundus photography, optical coherence tomography (OCT, Optical Coherence Tomography), confocal scanning laser ophthalmoscope (cSLO Confocal Scanning Laser Ophthalmoscope), line scanning ophthalmoscope (Line Scan Ophthalmoscope), etc. These imaging methods provide ophthalmologists with a way to directly observe the structure of the fundus. [0003] In recent years, with the advancement of technology and the needs of clinical diagnosis and scientific research in ophthalmology, the field of view of fundus imaging has also expanded from the traditional macular optic disc area to the peripheral area. Ultra-wide-angle imaging equipment can obtain unobstructed fundus images without mydriasis, which greatly optimizes ...

AI Technical Summary

Problems solved by technology

However, when the scanning lens group and collimated beam at the back end of OCT or cSLO remain unchanged, simply shortening the focal length of the eyepiece to expand the field of view will lead to a decrease in the numerical aperture of the entire optical system at the fundus end

This has two adverse effects on image quality: 1. A decrease in optical resolution proportional to the numerical aperture; 2. A decrease in signal strength proportional to the square of the numerical aperture

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