How do contact lenses affect floaters or flashes of light?

Contacts do not cause floaters to become larger, although you might become more aware of them with visual improvement. Contacts also do not cause flashes. If you have flashes and/or an increase or change in floaters, especially suddenly, this may be a sign of a more serious problem within the eye, having nothing to do with the contacts. You should have a dilated eye exam by a Eye M.D. (ophthalmologist) to be certain that you don't have problems within the eye.