Large-view-field mydriasis-free wide-refraction-compensation fundus imaging optical system

Abstract

The invention relates to a large-view-field mydriasis-free wide-refraction-compensation fundus imaging optical system. The large-view-field mydriasis-free wide-refraction-compensation fundus imaging optical system comprises an omentum objective lens group, a focusing lens group and an imaging lens group which are sequentially and coaxially arranged from left to right, and primary imaging is performed between the omentum objective lens group and the focusing lens group; the omentum objective lens group is formed by combining two balsaming lenses and a positive lens; the focusing lens group is composed of two meniscus lenses, and the focusing lens group adopts a stepping motor to drive an optical lens to perform accurate focusing according to a polynomial fitting curve; and the imaging lens group comprises two balsaming lenses in a quasi-symmetric form and a positive lens, and emergent light of the positive lens is vertically incident to an imaging focal plane. A secondary imaging system design is adopted, fundus large-view-field mydriasis-free imaging is achieved, and meanwhile stray light and ghost images can be eliminated; the minimum shooting pupil diameter is 2 mm, the imaging view field reaches up to 60 degrees, and diagnosis of eye diseases is facilitated; and the optical system is simple in structure, the installation and adjustment steps are simplified, each lens adopts a standard surface shape, and the processing is simple.

Description

technical field

[0001] The invention relates to the field of optical imaging technology, in particular to a fundus imaging optical system with large field of view, non-mydriatic and wide diopter compensation. Background technique

[0002] Medical research shows that the capillaries distributed on the retina of the human eye are the only small arteries and veins that can be directly observed in the human body, known as the "window of systemic diseases". Accurate and timely detection of fundus blood vessels is an important basis for early diagnosis of ophthalmic diseases and systemic diseases of the body. Therefore, the fundus camera has become an indispensable medical instrument. However, the imaging field of view of the traditional fundus camera is small, and the imaging field of view of the ordinary fundus camera is generally about 40 degrees, which brings constraints to the diagnosis of many diseases, and is easy to form stray light and ghost images. At the same time, the...

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