Introduction

“Cherry eye” is occurs when a gland associated with the cat’s ocular nictitating membrane (sometimes called the third eyelid) prolapses and becomes enlarged and inflamed. The nictitating membrane is a thin sheet of tissue that normally is well-anchored to the surrounding eye tissue. When prolapsed, the gland becomes visible and appears as a red mass bulging from the inside corner of the cat’s eye(s). The condition can look awful but usually can be treated successfully with medication and surgery.

Symptoms of “Cherry Eye” in Cats

“Cherry eye” is rare in cats. When it does occur, the red protrusion of tissue at the inner corner of the cat’s eye often is the only noticeable sign. Redness, swelling, excessive tearing and other signs of eye irritation may also be present. “Cherry eye” can occur in both eyes at the same time (bilateral), or it can show up in just one (unilateral). In cats, as in dogs, the gland normally prolapses quickly, and owners can be shocked by the doughy red mass protruding from their cat’s eye that only a few moments before appeared normal. Some cat breeds are predisposed to developing prolapsed third eyelids, including the Burmese and Persian.

If “cherry eye” is not corrected, the cat can develop additional and sometimes rather serious ocular complications. The gland within the third eyelid produces much of the fluid that makes up normal tear film. The primary function of the nictitating membrane is to moisturize and physically protect the eye - particularly the cornea. When this membrane is prolapsed, the eyes can rapidly become red, dry, irritated and inflamed from abnormal environmental exposure and insufficient tear production. There may be abnormal discharge from affected eyes as well. Some cats will rub or scratch at their eyes, which can damage the eyelids and possibly injure the cornea.

If you notice that your cat has what looks like “cherry eye,” make an appointment with your veterinarian as soon as possible. This typically is not a life-threatening condition, but it should be treated promptly to prevent permanent damage to the eye.