A subjective sensation of lights, sparks, or colors due to electrical or mechanical stimulation of the ocular system. SEE ALSO: Moore lightning streaks, under streak. SYN: photopsy. [photo- + G. opsis, vision]
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pho·top·sia fō-'täp-sē-ə n the perception of light (as luminous rays or flashes) that is purely subjective and accompanies a pathological condition esp. of the retina or brain
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n.
the sensation of flashes of light caused by mechanical stimulation of the retina of the eye, usually due to traction by the attached vitreous humour when the eye is moved.
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pho·top·sia (fo-topґse-ə) [photo- + -opsia] an appearance as of sparks or flashes due to retinal irritation.Medical dictionary. 2011.