Canine Cherry Eye Study Guide

Overview and Clinical Importance

Cherry eye is the common term for prolapse of the gland of the third eyelid (nictitating membrane), clinically known as prolapsed nictitating membrane gland (PNMG). This is the most common disorder affecting the canine third eyelid and represents a significant ophthalmic condition encountered in veterinary practice.

The condition occurs when the nictitating membrane gland, which is normally anchored to the base of the third eyelid by connective tissue attachments to the periorbita, prolapses dorsally and becomes visible as a smooth, pink to red, round mass protruding from behind the leading edge of the third eyelid. The appearance resembles a cherry, hence the common name.

Understanding cherry eye is critical for NAVLE success because it requires knowledge of ocular anatomy, appropriate surgical management principles, and recognition that gland removal is contraindicated due to the risk of subsequent keratoconjunctivitis sicca (KCS/dry eye).