l did some ''google'' research on temporary blindness, l only found info on causes that were related directly to clots / emboli / thickening of the blood... l was looking for something more general like a blow to the head to cause temporary blindness... something that may or may not clear up in time. Like a very hard blow to a certain part of the head (and therefore brain)... sort of like when you get amnesia from head trauma. Or perhaps trauma to the eyes themselves.

So does anyone know anything about temporary blindness (l mean not being able to see at all or well enough to walk without bumping into objects), due to trauma ?

Pouring salt in your eyes.

Once last year l lost sight in one eye for a couple hours. Scared me. Never did figure out what it was for sure. Someone told me it sounded like a migrane even though l had no associated headache.

l get temporary blindness in both my eyes right before l get a migraine. can sometimes happen for day before the head pain comes

It is called a 'cortical visual impairment' (which is a more accurate term, as some people with CV l are not rendered legally blind)- basically, a person has had some sort of injury to the BRAIN, not the eyes, that may cause constant or on and off difficulty with the brain is ability to 'understand' visual information that the eyes send.