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Effect of ultraviolet rays on eyes and ocular appendages of the rabbit


, : Effect of ultraviolet rays on eyes and ocular appendages of the rabbit. Boll Soc Med Chir Pavia 43(6): 717-743

Irradiation was performed on 8 gray rabbits and 6 albinos, 6 of the former and 4 of the latter receiving 1 irradiation each; 1 pigmented and 1 albino received 5 irradiations each, and a 2nd pair 7 irradiations each. A single exposure to an erythema-tous dose produced on the eyelids lesions essentially the same as those produced elsewhere on the skin of the same animal by like exposure; conjunctivitis of acute catarrhal type; terminating in 3-4 days; slight edema of the retina; and, in the pigmented rabbits, corneal edema and congestion of the tunica vasculosa. Under repeated irradiations with increasing doses the eyelids underwent an intense hyperplastic regenerative process (hyperkeratosis, acanthosis of the palpebral margin), but the palpebral irritation ceased and the conjunctivitis diminished in the albinos, which thus displayed acquired as well as natural actinic resistance. In the pigmented rabbits the eyeball under repeated exposure showed moderate leukocytic infiltration in the cornea, congestion in the iris, the ciliary body and the choroid, and edema of the fibrous layer of the retina; the albinos presented only the retinal lesion. Altogether the anatomic lesions and functional disturbances of the eyeball were slight compared with those of the retina, which perhaps could be explained by the fact that the rabbits used were only 1-2 mo. old, the transparent portions of the eye being more permeable to ultraviolet rays in young than in adult rabbits.

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