Explain briefly about retinal artery occlusion?

Eye vessel blockage: If the central retinal artery gets occluded, painless loss of monocular vision is the usual presenting symptom and there is complete loss of vision in that eye even though the fovea is not affected. The entire retina (with the exception of the fovea) becomes pale and swollen and opaque. These ocular strokes are caused by embolism & represents an eye emergency.

Retina: This is a blocked blood vessel in the eye...Basically a small ischemic stroke.

See a retina special: A blocked retinal artery (usually from an embolus that traveled from somewhere else in the body like the carotid artery or the heart) can lead to vision loss. It could be a branch or the central retinal artery. There are no good treatment, but a systemic workup to look for the source is required (carotid ultrasound and echocardiogram). A rarer cause is giant cell arteritis.