Optical system of portable fundus camera

Abstract

The invention belongs to the technical field of fundus medical science, concretely relating to an optical system of a portable fundus camera. Fundus images of human eyes are acquired by using an optical imaging method in order to determine pathologies and lesions of fundus diseases. The optical system of the portable fundus camera comprises two parts including an imaging system and an illuminatingsystem. The imaging system comprises a tested human eye, an ocular objective lens, an imaging objective lens and a reception device. The illuminating system comprises the tested eye, the ocular objective lens, a half-reflecting pellicle mirror, an illuminating objective lens, an annular diaphragm, a collecting mirror and a light source. The included angle formed between the half-reflecting pellicle mirror and a primary optical axis is 45 degrees. A dark light source commonly used in medical science is adopted by the light source. The reception device employs CCD or CMOS. Optical elements adopted by the system are all ordinary spherical mirrors which are convenient to process and manufacture. In this sense, cost is reduced. In addition, the system has just a few optical elements so that the structure is simple. The system is convenient to operate.

Description

technical field [0001] The invention relates to an ophthalmic optical instrument, in particular to a portable fundus camera optical system, which belongs to the field of medical fundus imaging. Background technique [0002] The human retina, also known as the fundus, is an important part of the human eye. The retina is a thin film with a highly complex structure, and a large number of capillaries are distributed on it. It is the only deep microvascular network in the human body that can be directly observed without trauma. Observing the vascular veins on the retina of the human eye can provide an important basis for doctors to diagnose various eye diseases and even systemic diseases. For example, the incidence of hypertension, hyperlipidemia, kidney disease, diabetes, pregnancy-induced hypertension, coronary heart disease and other diseases in our country is increasing year by year, and the early stage of the disease will be reflected in the fundus. As far as diabetes is c...

AI Technical Summary

Problems solved by technology

Large-scale desktop fundus camera equipment is often expensive, and requires professional medical staff to operate, equipment maintenance and inspection costs are expensive

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