Why Camera Flash Induces Red-Eye: Optical Pathway Analysis

为什么相机闪光灯会引发红眼现象：光学路径分析

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Red-eye occurs when flash illumination enters the eye through the dilated pupil, reflects off the choroid’s vascular layer, and exits along nearly the same path to the camera sensor.
This retroreflection is most pronounced in low-light conditions where pupils are fully dilated and retinal pigment epithelium absorption is minimized.

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