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Related Experiment Video

Updated: May 24, 2026

Establishment of a Severe Dry Eye Model Using Complete Dacryoadenectomy in Rabbits

Establishment of a Severe Dry Eye Model Using Complete Dacryoadenectomy in Rabbits

Published on: January 8, 2020

Third eyelid dermoid in a horse.

Shari M Greenberg¹, Caryn E Plummer, Dennis E Brooks

¹Department of Small and Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610-0126, USA.

Veterinary Ophthalmology

|February 22, 2012

Summary

A horse had chronic eye ulcers caused by abnormal hair growth from its third eyelid. Surgical removal of the hair-covered tissue, a dermoid, resolved the condition, offering a curative solution for this equine ophthalmology issue.

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Published on: November 11, 2025

Area of Science:

Veterinary Ophthalmology
Equine Surgery
Ophthalmic Pathology

Background:

Corneal ulcers in horses can stem from various causes, including foreign bodies and developmental abnormalities.
The third eyelid (nictitating membrane) protects the equine eye but can harbor conditions leading to ocular surface disease.
Recurrent corneal ulcers present a diagnostic challenge, requiring thorough examination of all ocular adnexa.

Observation:

An 8-year-old Gypsy Vanner gelding presented with chronic, recurrent corneal ulcers localized to the area behind the right third eyelid.
Ophthalmic examination revealed a cluster of aberrant hairs emanating from the margin of the third eyelid.
The affected portion of the third eyelid was surgically excised for further analysis.

Findings:

Histopathological examination confirmed the excised tissue was a dermoid, a benign congenital tumor containing hair.
The chronic keratitis was diagnosed as secondary to the presence of the third eyelid dermoid.
Surgical excision of the dermoid was performed to address the source of ocular irritation.

Implications:

Surgical excision of third eyelid dermoids is an effective treatment for secondary chronic keratitis and corneal ulcers in horses.
Early identification and surgical management of such congenital abnormalities can prevent long-term ocular surface damage.
This case highlights the importance of examining the third eyelid margin in horses with unexplained recurrent corneal disease.