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Anophthalmia
Anophthalmia occurs when chicks are hatched without eyes. It is a rare birth defect or the result of exposure to toxins while incubating or breeding parents. In many cases a rudiment of ocular tissue can remain, resulting in a weeping sinus.
Bovolenta, Paola, and Juan-Ramón Martinez-Morales. Genetics of congenital eye malformations: insights from chick experimental embryology.. Human genetics (2018)
Ghadage, R. B., et al Congenital anophthalmia in chicks. Indian Veterinary Journal (India) (2005)
