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Progressive retinal atrophy (PRA) is a group of genetic diseases seen in certain breeds of dogs and, more rarely, cats. Similar to retinitis pigmentosa in humans, [ 1 ] it is characterized by the bilateral degeneration of the retina , causing progressive vision loss culminating in blindness.
The retinal degeneration appears to be related to apoptosis of these cells. [11] SARDS must be distinguished from other causes of sudden blindness that have no visible pathology, including retrobulbar optic neuritis , a tumor at the optic chiasm , or other central nervous system diseases.
One such condition is progressive retinal atrophy, or PRA, which affects the light-sensitive cells at the back of the eye. It affects over 100 breeds, can be caused by multiple different genetic ...
Retinal diseases Progressive retinal atrophy (PRA) is a genetic disease of the retina that occurs bilaterally and is seen in certain breeds of dogs. It causes progressive vision loss culminating in blindness. [63] Retinal dysplasia is an eye disease affecting the retina. It is usually a nonprogressive disease and can be caused by viral ...
Cataracts typically occur when proteins break down in the lens of a dog's eye and clump together, obstructing the passage of light. [1] [2] There are several reasons cataracts may occur in dogs, such as heredity, trauma, aging, diabetes, glaucoma, and progressive retinal atrophy.
Eye disorders (e.g., cataracts, progressive retinal atrophy) Blood disorders (e.g., von Willebrand disease) Brachycephalic syndrome (respiratory issues in flat-faced breeds)
Retinal detachment occurs with complete retinal dysplasia, and is accompanied by blindness in that eye. Cataracts or glaucoma can also occur secondary to retinal dysplasia. Other causes of retinal dysplasia in dogs include infection with canine adenovirus or canine herpesvirus , or radiation of the eye in newborns.
Similar to rd1 in mice, Rod-cone dysplasia type 1 (rcd1-PRA) is a form of progressive retinal atrophy (PRA), with early onset of the disease. The Irish Setter is a characterized animal model of rcd1. The mutation is caused by a nonsense mutation in pde6b gene. Photoreceptors start degeneration at postnatal day 13 until a year after the dog is ...
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