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Acanthamoeba Keratitis is a rare but devastating eye condition caused by an amoeba. It can affect eyesight and even lead to blindness. It is a waterborne pathogen and contact lens wearers are particularly at risk. But as Professor John Dart, consultant ophthalmologist at Moorfields Eye Hospital in the UK, explains - there are several things you can do to prevent an infection.

(Image: Contact lens wearer, Credit: Getty Images.)