For the last few years I've had real problems with websites that have a dark background and pale text -- reading it for even a few seconds causes after-images, and much longer causes headaches. My vision prescription is up to date. I used to think this was just an effect of getting over 40, but so many sites use this combination that I wonder if it is actually just me. I thought I'd better find out before I start my campaign of fist-shaking at websites that use it.
i didn't like those sites either, harebrain.. only looked sideways squinty eyed at that text.
whenever there is weird text colour size or font that is difficult to read, i copy and paste it into word and read it on a plain page. thats how i deal with such stuff.
my problem with retinal flash like that, is that my retinas are problematic, having been injured to the point of being detached as a result of a car accident.
harebrain it sounds like you may have very sensitive retinas that may be subject to pinholing, small torn areas.
please have an ophamologist do a retinal scan to rule this out, if you haven't already. the average optician has neitherthe equipment nor the training for such a survey, at least not over here, and many people have this problem but undiagnosed and untreated.
caught early, its an easy laser surgery fix, in office, and not the extended surgery to try and rebuild your eyes that may still leave you with partial blindness, double vision or torn tendons in the eyes (cross-eyed), or if there isn't much left to work with, legal blindness.