1 Answer

Outline: In distichiasis, the position and direction of growth of some eyelashes is abnormal so that they touch the surface of the eyeball. Depending on the extent of the number, the degree of contact, the bristliness of the eyelashes, and perhaps other factors, this can lead to abrasion, ulceration, inflammation and infection of eye tissues which can cause serious discomfort, pain and, in severe cases if left untreated, to partial blindness. It is said to be a common disease in English Cocker spaniels (ECS) affecting 37% of the breed in one survey (or about 130,000 dogs of this breed in the UK). It tends to occur from early in life and persist throughout life. The genetics have not been determined but it seems likely that avoiding breeding from affected animals would lead to reduction in prevalence and elimination of the disease.

http://www.ufaw.org.uk/DISTICHIASISCOCKERSPANIEL.php