<unk>  is an eye disease affecting the retina of animals and, less commonly, humans. It is usually a nonprogressive disease and can be caused by viral infections, drugs, vitamin A deficiency, or genetic defects.<unk>  is characterized by folds or rosettes (round clumps) of the retinal tissue.
Retinal dysplasia
Macular hypoplasia
Optic nerve hypoplasia
Congenital cataract
Vitreoretinopathy
Retinal degeneration 
Macular hole
Fundic gland polyposis