Horse Recurrent Uveitis: Managing a Painful Eye Disease

Equine recurrent uveitis (ERU) causes repeated painful inflammation of the eye and is the leading cause of blindness in horses worldwide. Welfare-focused management is essential.

Key Facts

ERU affects approximately 8-25% of horses globally, making it the most common serious equine eye disease
Episodes involve acute intraocular inflammation causing pain, photophobia, and corneal cloudiness
Without treatment, repeated episodes cause progressive lens and retinal damage, leading to blindness
Appaloosas, Warmbloods, and Icelandic horses have elevated breed predisposition
A surgical implant (cyclosporine slow-release device) reduces recurrence rates significantly
Leptospirosis infection is linked to ERU in some populations — vaccination may reduce risk

Welfare Considerations

Acute ERU episodes cause intense pain — affected horses show blepharospasm, excessive tearing, photophobia, and behavioral changes consistent with severe ocular discomfort. Repeated episodes without treatment cause cumulative structural damage leading to permanent vision loss. The welfare harm of blindness in horses extends beyond the loss of sight — blind horses in herd settings face increased social vulnerability and require careful management to prevent injury. Surgical intervention (cyclosporine implant or vitrectomy) significantly reduces recurrence and preserves vision, dramatically improving long-term welfare.

What You Can Do

Seek specialist ophthalmological evaluation promptly for any episode of acute eye inflammation in your horse
Apply prescribed topical anti-inflammatory treatment consistently during acute episodes to reduce damage
Discuss surgical options (cyclosporine implant, vitrectomy) with a veterinary ophthalmologist for recurrent cases
Manage blind horses in familiar, safe environments with a compatible companion to reduce stress and injury risk