I'm not really sure what to say. If that is the only time you notice any symptoms from your eyes, then it is probably just some optical illusion or phenomenon that bothers you. See an ophthalmologist anyway to make sure you don't have any eye problems and to see if you need glasses.
I would recommend that you see an eyeMD who can further assess your symptoms.
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California
Google "scotopic sensitivity syndrome".