Focus-adjustable retina camera imaging system based on liquid lens

Abstract

The invention provides a focus-adjustable retina camera imaging system based on a liquid lens, which comprises an imaging system and an illuminating system, wherein the imaging system comprises an aperture diaphragm, an eye object lens, a spectroscope, an imaging object lens, the liquid lens and an image plane; the components are connected by the respective sequences that the eye object lens, the spectroscope, the imaging object lens and the liquid lens are in sequence disposed behind the aperture diaphragm, and the liquid lens is disposed between the imaging object lens and the image plane. The invention designs the imaging system based on a mechanical focus-adjusting manner, wherein the liquid variable-focus lens is introduced into the imaging system and surface curvature of the liquid lens can be changed continuously by adjusting voltage in order to realize clean human eye imaging with different visibilities. The focus-adjusting manner only needs to adopt a focus-fixed mechanical structure form, has a simple mechanical structure, reduces requirements for proficiency of an operator, and can realize more accurate adjustment by continuously changing the surface curvature of the lens.

Description

technical field [0001] The invention relates to a fundus camera, in particular to a liquid lens-based focus-adjustable fundus camera imaging system, which belongs to the field of medical fundus imaging. Background technique [0002] The retina of the human eye, also known as the fundus, is a thin film with a highly complex structure and an important part of the human eye. The position of the retina in the eye is equivalent to the receiver of the imaging system. There are a large number of blood vessels distributed on the retina of the eye. Observing the vascular veins on the retina of the human eye can provide an important basis for doctors to diagnose many eye diseases, and even many diseases in the whole body. For example, diabetic retinopathy is the main cause of blindness in diabetic patients and has become one of the four major lesions that cause blindness in patients. Diabetes is becoming a global epidemic. There are 347 million people suffering from diabetes worldwi...

AI Technical Summary

Problems solved by technology

Most of the fundus cameras developed in China have the following problems: the equipment requires professional doctors or nurses to operate, the equipment cost and medical expenses are high, and drugs are needed to dilate the human eye, and mydriasis has certain side effects on the human body

These all severely limit the use of fundus cameras

Images