Test your knowledge. Chronic red eye.

A 62 year old woman has come to the practice complaining of an irritable, red eye (Figure 1). This has occurred intermittently over a number of years. The condition tends to resolve over a week or so with the help of a series of lid bathes and hot compresses. For mild to moderate episodes she has previously been prescribed Predsol steroid eye drops for which she has responded quickly. The patient feels that the episodes are increasing and the eye is remaining 'gritty' for longer. Vision in the right eye has become poorer than the left eye.