Moon blindness

Moon blindness, also known as equine recurrent uveitis (ERU), is a chronic, progressive inflammatory eye disease in horses. It is the most common cause of blindness in horses worldwide. Despite its name, moon blindness is not directly related to the moon. The term originated from the belief in ancient times that the disease was caused by exposure to moonlight.

Causes

The exact cause of moon blindness is not fully understood. However, it is believed to be an autoimmune response, where the horse's immune system attacks its own tissues in the eye. This can be triggered by various factors, including bacterial infections, particularly those caused by the bacterium Leptospira, and trauma to the eye.

Symptoms

The symptoms of moon blindness can vary, but often include redness, swelling, and pain in the eye. The horse may also exhibit sensitivity to light, excessive tearing, and a cloudy or blue appearance to the eye. In advanced cases, moon blindness can lead to partial or complete loss of vision.

Diagnosis

Diagnosis of moon blindness is based on the clinical signs and history of the horse. A thorough eye examination is performed, which may include an examination of the inside of the eye using an ophthalmoscope. In some cases, laboratory tests may be performed to identify any underlying infections.

Treatment

Treatment for moon blindness aims to reduce inflammation and pain, and to treat any underlying causes. This may involve the use of anti-inflammatory drugs, antibiotics, and in some cases, surgery. Early detection and treatment are crucial to prevent permanent damage to the eye.

Prevention

Prevention strategies for moon blindness include regular eye examinations, good hygiene practices to reduce the risk of bacterial infections, and vaccination where available.

See also

• Horse health
• Equine ophthalmology
• Uveitis

References

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