- The condition resulting from an overexposure to ultraviolet light, or from the combination of exposure to certain wavelengths of light and a phototoxic substance. SEE ALSO: photosensitization. [photo- + G. toxikon, poison]
* * *n.damage caused by prolonged exposure to light; for example, retinal phototoxicity is damage to the retina of the eye as a result of prolonged exposure to light.
* * *pho·to·tox·ic·i·ty (fo″to-tok-sisґĭ-te) [photo- + toxicity] a type of photosensitivity that is induced by a toxic substance, in contrast to a photoallergy. See also phototoxic dermatitis, under dermatitis. phototoxic adj
Medical dictionary. 2011.