Horse Recurrent Uveitis Welfare | Animal Welfare Hub

Equine recurrent uveitis (ERU) is the leading cause of blindness in horses worldwide. The painful cyclic episodes of ocular inflammation cause significant welfare harm and require dedicated long-term management.

Key Facts

ERU affects approximately 8-25% of horses worldwide, with Appaloosas at dramatically elevated risk
The disease involves recurrent cycles of intraocular inflammation that cause progressive cumulative damage
Each episode causes pain and light sensitivity; without treatment, each recurrence accelerates vision loss
Leptospirosis infection is associated with ERU in many cases, particularly in specific geographic regions
Surgical vitrectomy or suprachoroidal cyclosporine implants can significantly reduce recurrence frequency

Welfare Considerations

Horses with active uveitis episodes experience intense ocular pain, photophobia, and behavioral changes indicating suffering. The progressive nature means that without intervention, horses experience repeated painful episodes culminating in blindness. Blind horses can live good lives with appropriate management, but the pain of each inflammatory episode causes avoidable suffering. Early diagnosis and aggressive management - ideally with cyclosporine implants for severe cases - reduces both the frequency of painful episodes and the rate of vision loss. Management requires owner commitment to recognizing early episode signs and seeking prompt treatment.

What You Can Do

Seek veterinary evaluation immediately for any horse showing a closed eye, tearing, or light sensitivity
Discuss cyclosporine implant surgery with an equine ophthalmologist for horses with frequent recurrences
Create a dark shelter option for light-sensitive horses experiencing active uveitis episodes
Work with your vet to develop a written ERU management plan including when to call for emergency treatment