Entropion

This condition exists when either the upper or lower lid of the eye rolls inward. This can affect only part of each eyelid or affect the entire eyelid. Common in dogs, especially chows, shar-peis, bulldogs, pugs, Pekingese, and Poodles, but can be present in any breed. Not common in cats, but has been seen in Persians and Himalayans.

The main cause appears to be genetic predisposition, but chronic eye irritation can also cause the eyelids to roll. Severe weight loss around the head causing the eye to recede can also cause entropion.

Eyelashes and the hair around the eyes rub on the cornea and cause significant irritation. In mild cases, eye discharge and increased blinking may be all that is seen. In more severe cases, abundant pus-like discharge, reddened eyes, pigmentation of the cornea, and discomfort are common. If left untreated, many of these patients have severe corneal damage.

Surgery is generally recommended if the patient has constant irritation. Surgery should not be performed until the patient is at least 6 months of age to allow full development. All patients need to have artificial tears or antibiotic ointment applied to the eyes several times a day to minimize rubbing of the hair on the corneas.