Tibetan Spaniel - Symptoms at three to five years old. Tibetan Terrier - PRA3/RCD4 disease of middle age dogs. http://www.ttca-online.org/html/Petersen-Jones_PRA_article.pdf
Samoyed - Symptoms by three to five years old. Rod-cone dysplasia
This type of PRA has an early onset of severe vision loss. It is caused by a defect in the gene for cGMP-phosphodiesterase, which leads to retinal levels of cyclic guanosine monophosphate ten times normal. Rod-cone dysplasia type 1
Irish Setter - Rod cell response is nearly absent. Night blindness by six to eight weeks old, often blind by one year old. Sloughi - A DNA test can identify whether Sloughis have the mutated recessive gene. This has enabled breeders to breed away from PRA, and the disease is now rare in the breed. Rod-cone dysplasia type 2
Collie - Rod cell response is nearly absent. Night blindness by six weeks old, blind by one to two years old. Rod-cone dysplasia type 3
Cardigan Welsh Corgi

Rod dysplasia
Norwegian Elkhound - Characterized by dysplasia of the rod cell unit and subsequent degeneration of the cone cell unit. Rod cell response is nearly absent. Night blindness by six months old, blind by three to five years old. Rod dysplasia has now been bred out of this breed. Early retinal degeneration
Norwegian Elkhound - Night blindness by six weeks old, blind by twelve to eighteen months old. Photoreceptor dysplasia
This is caused by an abnormal development of both rod and cone cells. Dogs are initially night blind and then progress to day blindness. Miniature Schnauzer - Slowly progressive, not seen until two to five years old.
Breeds in which the PRA gene is recessive may still be carriers of the gene and pass it on to their offspring, however, even if they lack symptoms, and it is also possible for onset of the disease to be later than expected, making this an imperfect test at best. Management
There is no treatment for PRA. However, most dogs that suffer from this disease adjust remarkably well. To maximize the quality of the dogs life,  follow these guidelines:

Do not rearrange furniture, as the dog has memorized the layout of the environment
Use a short leash when walking a dog with blindness from advanced PRA
Erect safety barriers around pools or balconies

See also
Sudden acquired retinal degeneration

References
External links
Article on PRA
Article on Cataracts