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photopsia
photopsia (fəʊˈtɒpsɪə) n (Medicine) med a rare disease of the eye's retina that results in the perception of flashes of light
photopsia
photopsia [fo-top´se-ah] an appearance as of sparks or flashes, in retinal irritation.pho·top·si·a (fō-top'sē-ă), A subjective sensation of lights, sparks, or colors due to electrical or mechanical stimulation of the ocular system.
See also: Moore lightning streaks. Synonym(s): photopsy [photo- + G. opsis, vision] pho·top·si·a (fō-top'sē-ă) A subjective sensation of lights, sparks, or colors due to electrical or mechanical stimulation of the ocular system.
Synonym(s): photopsy. [photo- + G. opsis, vision]photopsia Visual sensations of light originating in the eyes or the nervous system and due to stimulation of the retinas or visual nerve pathways other than by light. Mechanical stimuli from traction on the retina by the VITREOUS BODY can cause photopsia. They are examples of entoptic phenomena. Also known as phosphenes.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. |