I say visual but it's no eye problem, I know they are coming from the brain. So: - I can't read any light colored letters on dark background. The higher the contrast, the more difficult or even impossible to read. White text on black background is almost impossible to read. If I concentrate even for a few seconds on such text, I'm starting to faint. A software to quickly invert colors saves me in such cases. - I can't watch many repeating patterns. For example one and the same image in multiple rows or columns , many of them. It somehow confuses my brain. - The third problem is actually a combination of the first two. Watching repeating black and white stripes confuses my brain and I'm starting to faint. - That was for static images. It becomes even worse if I watch quickly flashing high contrast images (those that cause epileptic seizures in some people). They affect me in a similar way, only I don't have a seizure but PEM after watching some. Anyone experience something similar?