What is the definition of photosensitivity disorders?

Abnormal responses to sunlight or artificial light
due to extreme reactivity of light-absorbing
molecules in tissues. It refers almost exclusively
to skin photosensitivity, including sunburn,
reactions due to repeated prolonged exposure in
the absence of photosensitizing factors, and
reactions requiring photosensitizing factors such
as photosensitizing agents and certain diseases.
With restricted reference to skin tissue, it does
not include photosensitivity of the eye to light,
as in photophobia or photosensitive epilepsy.

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