Actually temporary blindness is usually no cause for too much worry. But as shadowhound said go see you physician to be on the safe side. It's impoosible to diagnose over the net you know.
AFAIK there is no absolute diagnosis for this. It could be caused by migraines, cortical edemas, insect bites etc. etc. So call your physician and make an appointment. [img]smile.gif[/img]