The uvea is the vascular middle layer of the eye. It is traditionally divided into three areas, from front to back, the Iris, Ciliary body and Choroid. In addition some uveal regions have special functions of great importance, including secretion of the aqueous humour by the ciliary processes, control of accommodation (focus) by the ciliary body, and optimisation of retinal illumination by the iris’s control over the pupil. Many of these functions are under the control of the autonomic nervous system.
Equine recurrent uveitis (also known as “moon blindness” or periodic ophthalmia) is a common disease affecting the equine eye. It is the most common cause of blindness in horses.
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