Pho‐top″si‐a (?), n. [NL., fr. Gr. φω̑σ, φωτόσ, light + � sight.] (Med.) An affection of the eye, in which the patient perceives luminous rays, flashes, coruscations, etc. See phosphene.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.