Abstract

In vivo irradiation of the eye of the rainbow trout with moderately high doses of UV-B (0.75 to 1.5 J cm 2) can produce corneal damage and persistent cataractous changes in the anterior part of the crystalline lens within hours. Irradiation with UV-C (0.25 J cm 2) also produces corneal damage but only temporary lens changes after 2–3 days. Cataractous changes can also occur following mechanical damage to the cornea ex vivo, and develop concurrently with decreases in the osmolarity of the aqueous humour of at least 30 mOsm l −1; no change in aqueous humour osmolality was detected at the onset of cataracts associated with UVB irradiation in vivo. The UVB-associated anterior cataracts are thus not obviously caused by aqueous humour changes although, when there is concurrent mechanical damage with the ultraviolet radiation, hypo-osmotic changes may contribute to the cataract formation.

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