Flickering vision (like the old-time movies) with disorientation. Will only last a few moments. Sometimes with dizziness.

Refer patient with flashes urgently to ophthalmologist because they suggest intraocular disorder (vitreous, retina, optic nerve)
Refer patient with flickers urgently to ophthalmologist, neuro-ophthalmologist or neurologist unless diagnosis of migraine is obvious because they could also suggest transient ischemic attack or seizure


http://kellogg.umich.edu/theeyeshaveit/common/flashes_flickers.html

I agree, get an emergency appt with an ophthalmologist ( is an MD) not an optometrist (not an MD). You may be able to get them in quicker than a neurologist. The Eye Doctor can always refer you.