I started getting ocular migraines (with NO headache) a few years ago after I started vigorous physical training.
It starts out as a tiny spot of nebulous flickering, like a bad pixel or two in my visual field; at first I’d rub my eyes to clear them – it feels like I’ve got eye-boogers or something because the visual field feels blocked.
The flickering then intensifies and over about 15 minutes, solidifies into a big rounded L-shaped figure, complete with the flickering, zig-zag patterns. When it peaks out at 20 minutes, I can’t really read or drive a car or anything because the central part of my visual field is obscured. Usually after 20 minutes, it quickly abates and is gone in the next 10 minutes. I have noticed a vague kind of nausea, tension, and edgy feel associated with it, but this could be from the exertion. After subsiding I feel no further ill effects.
The predominant color seems black and white, but there’s a colorful faint rainbow aura.
Because of the fixed nature of L pattern, it is different that drug induced “hallucinations” (at least according to a friend of a friend).
I went to an ophthalmologist who diagnosed it as harmless ocular migraine. I haven’t had an episode in several month.
