DNA test - CSNB
Congenital stationary night blindness
Congenital Stationary Night Blindness (CSNB), also called hereditary retinal dystrophy,is an inherited disease caused by a defect in the gene RPE65, which encodes a protein that plays a crucial role in vision. The symptoms include night
blindness and a loss of vision in daylight that can vary between individual dogs. The disease shows a recessive mode of inheritance.
Source of DNA Test: http://www.thekennelclub.org.uk/download/8288/dnatestsworldwide.pdf