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What is Equine Recurrent Uveitis?

Equine recurrent uveitis (ERU) is a devastating disease in horses that can be difficult to diagnose and even harder to treat. This chronic inflammatory disease of the eye is typically characterized by recurrent episodes of uveitis (inflammation of the inside of the eye) separated by periods of inactivity. While ERU is the most common cause of blindness in horses and can affect any breed, it’s most commonly seen in Appaloosas and Dutch Warmbloods and draft horses. ERU is also referred to as “moon blindness” because it was once thought that the inflammatory episodes coincided with the phases of the moon. The disease should not be confused with congenital stationary night blindness, another disease of the eye that also commonly affects Appaloosa horses. Veterinarians typically divide equine recurrent uveitis into three different forms: • In the classic form, a horse will show episodes of inflammation separated by periods of inactivity. As…

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