300
This occurrence may be preceeded by amaurosis fugax, and can be diagnosed based on fundoscopic exam showing boxcarring of the retinal vessels, retinal edema, and the classic cherry red spot on the fovea.
What is central retinal artery occlusion?
(Not so fun fact: This needs referred immediately. Irreversible vision loss can occur in as little at 100 minutes. At risk populations include elderly vasculopaths, young folks with sickle cell and syphilis, and people with collagen vascular diseases)
(Fun Fact: Don't do the ocular massage. It doesn't work. And it isn't very comfortable.)