Medicine
fromwww.theguardian.com
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Diplopia, or double vision, results from eye muscle misalignment, affecting daily activities and often requiring surgical intervention for correction.
The front of the eye, and the cornea in particular, has more nerve endings per millimetre square than anywhere else in the body, says Dr Dilani Siriwardena, a consultant NHS ophthalmologist at Moorfields eye hospital in London and vice-president of the Royal College of Ophthalmologists. So it can be very sensitive. The tiniest scratch or piece of grit in your eye can feel like a brick.