视网膜脱落是因视网膜从下层支撑组织上剥离下来而导致急性眼部疾病。起初可能只是部分的脱落，如果没有及时治疗整个视网膜都会脱落，从而导致视力损伤和失明。

视网膜是眼球后部一层很薄的感光组织。眼睛将光聚焦在视网膜上，就像照相机把光聚焦在底片上一样。视网膜将聚焦的影像转换成神经冲动，然后通过视神经传给大脑。有时头眼部的撞击和外伤会导致视网膜小的撕裂，玻璃体从裂口渗到视网膜下导致视网膜脱落，就像墙纸上的气泡导致墙纸脱落一样。

Retinal detachment is a disorder of the eye in which the retina detaches from the retinal pigment epithelium. Retinal detachments can be caused by fluid leaking behind the retina through tears, by traction on the retina, or by fluid exuding from the retina. The visual prognosis of a retinal detachment is dependent on the duration of the detachment, whether the macula was detached, and the underlying health of both the retina and circulatory system of the eye.