Abstract
Episcleritis is a benign inflammatory condition affecting the episcleral layer, the outermost layer of the sclera of the eye. There are two main types of episcleritis, nodular and simple. Nodular episcleritis accounts for 30% of cases and presents with a discrete elevated area of inflamed tissue (nodule) in the episcleral layer surrounded by dilated blood vessels. Simple episcleritis also presents with a red eye and dilated blood vessels but not an elevated area of inflamed tissue. It is subdivided into two groups; diffuse simple episcleritis, where the inflammation is generalised, and sectoral simple episcleritis, where the inflammation is restricted to one region.
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