Scleritis is inflammation of the sclera and deep episcleral vessels. It typically presents with a deep aching pain, not responding to simple analgesia and sometimes waking the patient from sleep. Scleritis is an uncommon cause of red eye, but vital to diagnose, as untreated it may be vision (or globe) threatening, and a diagnosis of scleritis may point the clinician towards the diagnosis of an underlying systemic disease. Scleritis may be classified by location (anterior/posterior), appearance (nodular/diffuse/sectoral), presence of occlusive vasculitis (necrotising/non- necrotising) and aetiology (infectious/non-infectious/surgically induced)1.
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