Vision changes may indicate a serious problem with the tissue that
lines the back of the eyeball (retina), optic nerve, or blood vessels in the eye. Evaluation by a health professional is needed
right away for sudden vision changes, such as:
Flashes of light (photopsia). Photopsia is brief
but recurrent streaks, sparks, or flickers of light, particularly when you move
your eyes or head. The flashes of light may be easier to see when you look
toward a dark background. The brief flashes may occur with
This information is produced and provided by the National
Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National
Institute via the Internet web site at http://
.gov or call 1-800-4-CANCER.
WebMD Medical Reference from Healthwise
July 29, 2013
This information is not intended to replace the advice of a doctor.
Healthwise disclaims any liability for the decisions you make based on this