photopsia /pho·top·sia/ (fo-top´se-ah) appearance as of sparks or flashes in retinal irritation.
pho·top·si·a (f -t p s - )n. The sensation of seeing lights, sparks, or colors caused by retinal or cerebral disease. Also called photopsy. |
photopsia
Hallucinatory perceptions such as sparks, lights or colours arising in the absence of light stimuli and observed when the eyes are closed. They occur often as a result of diseases of the optic nerve, retina (e.g. retinal and vitreous detachment) or the brain, migraine, or they can also occur with pressure upon the closed eye. See floaters; flashes; cytomegalovirus retinitis; Fuchs' spot.
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