Hereditary Defects Advice - Primary Lens Luxation (PLL)

PLL is caused by a weakening in the ligament (zonule) holding the lens in place within the eye. It is most commonly first seen in dogs at around age 4 - usually in one eye initially - however both eyes are normally eventually affected. It can lead to secondary glaucoma, and it is also sometimes a consequence of primary glaucoma. Owners may notice that there is a change in the appearance of the eye, and if treated quickly, surgery can remove the affected lens or lenses.

PLL is thought to be a recessive inherited condition in Border Collies, although a DNA test has not been developed. It can be detected during the routine eye exam – as described in the section on CEA.