DNA test - prcd-PRA
Progressive rod cone degeneration - Progressive retinal atrophy
prcd-PRA (progressive Retinal Atrophy) causes cells in the retina at the back of the eye to degenerate and die, even though the cells seem to develop normally early in life. Owners of affected dogs first notice that their dog becomes night blind, but this eventually progresses to total blindness. The age of onset of first signs varies from breed to breed, however, in all cases puppies are born with perfect vision and their sight begins to degenerate later in life, from around 3 years of age or later. The condition results from a single recessive mutation of a gene known as prcd.
Source of DNA Test: http://www.thekennelclub.org.uk/download/8288/dnatestsworldwide.pdf