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Wiktionary
photosensitivity

n. sensitivity to light, especially a heightened response to light

WordNet
photosensitivity

n. sensitivity to the action of radiant energy [syn: radiosensitivity]

Wikipedia
Photosensitivity

Photosensitivity is the amount to which an object reacts upon receiving photons, especially visible light. In medicine, the term is principally used for abnormal reactions of the skin, and two types are distinguished, photoallergy and phototoxicity. The photosensitive ganglion cells in the mammalian eye are a separate class of light-detecting cells from the photoreceptor cells that function in vision.

Usage examples of "photosensitivity".

As did the medication that caused photosensitivity, and the fact that Bastien merely picked at his food most of the time, seeming to have no appetite.