Screening Scheme Description

BVA/KC/ISDS Gonioscopy

Gonioscopy is an eye examination, separate from the routine eye examination (BVA/KC/ISDS Eye Scheme), done to detect glaucoma predisposition (how likely the eye is to develop glaucoma). The gonioscopy test should be carried out every 3 years, unless any evidence to the contrary emerges. The first test can be performed in dogs from 6 months of age onwards and current advice is that gonioscopy is performed at approximately 1, 4 and 7-8 years of age.

Details about the disease

Glaucoma is characterised by pressure on the eye, which is caused by inadequate drainage of fluid from inside the eye. If left untreated the optic nerve will be permanently damaged, resulting in blindness.

Primary glaucoma is an inherited condition. Secondary glaucoma is caused by other eye diseases (e.g. lens luxation) that lead to improper drainage of fluid from inside the eye.

Clinical signs

Clinical signs include cloudiness at the front of the eye, red eyeballs, vision loss and dilated pupil. Your dog may rub their eyes, squint and flutter their eyelids.

How it is inherited

The precise modes of inheritance have not been determined for affected breeds, but clear breed and line predisposition indicate a genetically determined cause, albeit with a likely complex mode of inheritance.

Where can I find more information about primary glaucoma and Gonioscopy?

An information leaflet can be found at


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