What does the term "moon blindness" refer to in equine health?

The term "moon blindness" specifically refers to recurrent uveitis, which is an inflammation of the uveal tract in a horse's eye. This condition is characterized by episodes of inflammation that can lead to pain, swelling, and, ultimately, vision problems. The name "moon blindness" is derived from the cyclical nature of the episodes, which was believed by early horsemen to be influenced by the lunar phases. In severe cases, recurrent uveitis can cause significant damage to the eye and result in permanent vision loss.

Other options do not accurately define moon blindness. For instance, blindness caused by bright light refers to a different ocular response and is not linked to the cyclical inflammatory nature seen in recurrent uveitis. General vision loss is a broader term that could apply to various causes and is not specific to moon blindness. Temporary darkness perception, although it involves vision changes, does not relate directly to the inflammatory condition that moon blindness describes. Understanding the specificity of recurrent uveitis is crucial for proper diagnosis and treatment in equine health.