Xerophthalmia detection lighting and imaging system

Abstract

The invention discloses a xerophthalmia detection lighting and imaging system, comprising: a Placido disc that includes a plurality of concentric rings in black and white; a lighting optical system that is arranged on the rear surface of the Placido disc and that includes a plurality of groups of LED units arranged in circular form, wherein the lighting optical system is used to project the Placido disc to tear film; an imaging optical system that receives a Placido disc projection on the tear film and is along an imaging optical path, wherein the imaging optical system comprises an imaging objective and a CCD (charge coupled device) camera in sequence. The xerophthalmia detection lighting and imaging system has the advantages that a series of pictures of the eye surface tea film of a subject from intactness to break can be acquired in noninvasive manner, break time of the tea film can be acquired by post-processing through an image algorithm, and whether the break time of the tear film of the subject is abnormal or not can be judged; the system according to the technical scheme can ease the pain of a patient, and detection results are more stable and accurate.

Description

technical field [0001] The invention relates to the field of optical detection. More specifically, the present invention relates to an illumination imaging system for dry eye syndrome detection. Background technique [0002] Dry eye, also known as keratoconjunctival xerosis, common symptoms include dry eyes, easy fatigue, itchy eyes, foreign body sensation, burning sensation, sticky secretions, fear of wind, photophobia, and sensitivity to external stimuli, etc. The prevalence of dry eye is about 21%-33.7%. At present, the incidence of dry eye in the world is increasing year by year, and it has developed into a common and frequently-occurring disease that endangers health. With the widespread use of electronic screens, the deterioration of the environment, the abuse of eye drops, the wearing of contact lenses and other reasons, dry eye will continue to increase. The main cause of dry eye is the abnormal rupture of the tear film on the ocular surface. Related research artic...

AI Technical Summary

Problems solved by technology

These traditional methods for evaluating tear film stability are invasive tear break-up time (IBUT), which has limitations such as large variability, low repeatability, and susceptibility to external influences.

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