Histology of the Retina and Choroid in Ducklings Photosensitized by Feeding Ammi majus Seeds

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Abstract
Ducklings were photosensitized by the force-feeding of Ammi majus seeds for 5 days and exposure to sunlight. In birds sacrificed 2 weeks later, acute signs consisted of moderate vacuolization of ganglion cells. In birds sacrificed 3 ½ and 5 ½ months later, long-term effects of photosensitization included pigmentary retinopathy and hyperplasia of the retinal pigment epithelium. At the extreme periphery of the choroid, congestion and dilatation of the vessels, and transudation were observed. The probable mechanism whereby the photosensitization induces these changes in the retina and choroid of these ducklings is discussed.

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