I'm not really sure if that (visual disturbance) is the correct terminology for what my daughter has described to me, but I wonder if anyone else has experienced this or similar?
Sometimes when we are travelling by car (I'm driving) she says to me 'Does the sky look red to you over there?' (and it doesn't to me)or she may say she can see red spots in the sky. It's not after looking at the sun (not been much of that lately round here!) or a bright light, she says it happens quite often.
Any ideas?