Best answer: What causes moon blindness in horses?

The leptospirosis bacteria and the bacteria that causes strangles may be two of the more common bacterial causes. Equine flu, tooth and hoof abscesses may also trigger moon blindness. If there is a parasite connection, the moon blindness may be triggered by worming medication.

What is the most common cause of blindness in horses?

Equine Recurrent Uveitis (ERU) is an immune-mediated inflammatory condition of the eye and is the most common cause of blindness in horses. It may affect one or both eyes. You may have heard other names for this disease, such as Moon Blindness, Iridocyclitis, and Periodic Ophthalmia.

What causes sudden blindness in horses?


Acute blindness may be associated with head or ocular trauma, ERU, glaucoma, cataracts, intraocular hemorrhage, exudative optic neuritis, retinal detachment or CNS disease. Acutely blind horses are extremely agitated, anxious and dangerous.

How do I know if my horse has moon blindness?

Symptoms of moon blindness include inflammation and redness of the eye area, murkiness or white discoloration of the eye, tearing, squinting, and profuse but clear tearing. The horse will be reluctant to be in bright sunlight. Although it may not be evident, the horse will be feeling pain from the symptoms.

Is moon blindness permanent?

Causes of Uveitis

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But in the chronic, repeating form known as equine recurrent uveitis (ERU) or moon blindness, the disease can lead to permanent damage and eventually blindness—and it’s this manifestation that horse owners particularly worry about.

Can humans get moon blindness?

Humans: Symptoms in humans include diarrhea, abdominal cramps, bloating, and weight loss. Treatment and prevention: The antibiotic metronidazole is commonly used to treat giardiasis in both species. Leptospirosis can be associated with equine recurrent uveitis (moon blindness).

How do you help a blind horse?

Hanging a wind chime near the water trough or run-in shed is a way to give the horse some extra guidance. A radio playing in a nearby barn will also help the horse stay oriented. Avoid turning the blind horse out in a large group of horses, but don’t isolate him, either. Choose a quiet horse to be a buddy.

What is a horse’s range of vision?

Horses are thought to have vision somewhere in the range of 20/30 to 20/60 – meaning that they can see from 20 feet away what an average human can see from 30-60 feet away (by contrast, cats are thought to have 20/100 vision). The retina also contains cones, or cells that sense color.

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