If a headache follows, it is called a migraine headache. If there is no subsequent headache, the light flashes are referred to as ophthalmic migraine, or migraine without headache. Most of the time the vitreous separates from the retina without causing any problems. Occasionally, flashing lights are associated with many new floaters and even a blacking out of part of the field of vision. If this occurs, immediate examination by an ophthalmologist is important to determine whether a retinal tear or retinal detachment has developed.
Retinal tears require treatment to prevent the retina from detaching.
Retinal detachment is a serious problem that must be repaired surgically. Summary Floaters and flashing lights usually do not indicate any serious eye problem. If a large number develop or if they seem to be much worse over a period of time, an examination by an ophthalmologist is recommended. The examination involves careful observation of the retina and vitreous. Medical training and experience are required to perform this examination properly.