Complications Following Nictitating Membrane Resection in Horses: 92 Eyes (2015-2024)
Tiantian Wu1, Darko Stefanovski1, Nicole M Scherrer1
1Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania, USA.
Veterinary Ophthalmology
|August 6, 2026
Summary
Nictitating membrane resection in horses is generally safe, with most complications being minor and manageable. Chronic mild epiphora is the most common long-term issue following this equine eye surgery.
Area of Science:
- Veterinary ophthalmology
- Equine surgery
Background:
- Nictitating membrane resection is a common surgical procedure in horses.
- Understanding potential complications is crucial for equine welfare and surgical success.
Purpose of the Study:
- To evaluate the complications associated with nictitating membrane resection in horses.
- To provide data on the risks of this equine surgical procedure.
Main Methods:
- Retrospective review of medical records for 83 horses (92 eyes) undergoing nictitating membrane resection.
- Data collection included owner questionnaires and follow-up examinations for at least one month post-surgery.
Main Results:
- Overall owner-reported complication rate was 28.2%.
- Short-term complications included fat prolapse (4.3%) and hemorrhage (1.1%).
- Long-term complications were primarily epiphora (22.8%) and conjunctivitis (9.8%).
Conclusions:
- Complications following nictitating membrane resection in horses are generally minor and manageable.
- Chronic mild epiphora is the most frequent persistent complication.
- Owners should be informed about the potential for chronic epiphora post-surgery.
