Generally speaking, legal blindness is 20/200 or worse, in the better eye, after correction. OR, less than 20 degree field of view. However, some people can have low vision, which means they still have poor vision but not necessarily legal blindness. The "after correction" part is important. People can have very poor vision, but if glasses correct most of it, then that doesn't really count (my own vision without glasses is Counting Fingers, or roughly 20/1600-20/2000, but with glasses, it is 20/25).

It is hard to tell what eye condition you may have with something like that. It potentially be a few things, you should ask your doctor more about that. The brain shutting off the right eye may be amblyopia, but you should check with your medical professionals.

There are three parts to your visual system. The eyeball, which recieves the light. The optic nerve, which transmits the information. And the brain, which processes the information. Damage to any of those systems can cause vision issues. From the description, it likely sounds like an issue with the eyeball, possibly some sort of retina degeneration. Also possibly cataracts. Once again, best to talk to your doctor.

I don't think someone is visually impaired until their problem is not solved by glasses and affects them daily. The definition is any vision problem.

(Ianad) The static you talk about sounds like an optic nerve issue. Keep pushing to see other specialists, get a copy of your medical records and write to people doing eye/brain research. John Hopkins, Cleveland clinic, university of berkley, NYU, Columbia are places to start looking.