aphotesthesia

Decreased sensitivity of the retina to light caused by excessive exposure to sunlight. [G. a- priv. + phos, light, + aisthesis, perception]

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aphot·es·the·sia (a″fōt-es-theґzhə) [a-¹ + phot- + esthesia] reduced sensitivity of the retina to light resulting from excessive exposure to rays of the sun.