What is another term for prolapse of the gland of the third eyelid in horses?

• A. Cherry eye
• B. Entropion
• C. Proptosis
• D. Keratitis

Answer: (A)

The condition being tested is the common name for prolapse of the lacrimal gland of the third eyelid. When the gland that sits at the base of the nictitating membrane (the third eyelid) slips forward through the medial canthus, it forms a round, pink–red, cherry-like mass. That characteristic appearance is why this is called cherry eye. The other terms describe different problems: entropion is the eyelid turning inward, proptosis is the eyeball bulging forward, and keratitis is inflammation of the cornea. So the best answer is the term that directly describes the protruding lacrimal gland, giving the classic cherry-like swelling you’d expect to see in horses. Treatment typically aims to relocate and secure the gland to preserve tear production and prevent recurrence.