Eyesight has 'been bad for as long as I can remember'

Ryan Searle hopes his run to the World Darts Championship semi-finals can "inspire people who can't see as well as others" and explains how he is affected by a rare eyesight condition called Autosomal Dominant Optic Atrophy.

READ MORE: 'There's no cure' - the eye condition affecting Littler's opponent Searle