Mary Fisher
Para swimming (S11 and SM11 blind classifications)
Age: 23
Previous Paralympics: London
What got you into swimming?
The independence it brought. I could learn butterfly and tumble turns, which gave me confidence when I struggled with other things because of my vision. At high school, I kept swimming as a hobby because it made me feel normal, which is all you want when you're learning Braille and using a white cane. All my friends were learning to drive and I was learning to read again. Once I started taking swimming seriously and getting qualification times, it became exciting.
How is your sight affected?
I have a congenital condition called aniridia, which means my irises are absent. When I was young, I had about 10 per cent normal vision. I could read large print and see things up close. I lost the rest of that as a teenager but I can still tell the difference between light and dark. I wear blacked-out goggles when racing because my events are for totally blind athletes, but some have light perception and some don't. I also need a tapper who holds a stick with a polystyrene ball on the end at the edge of the pool to give me a gauge when I'm 2m from the wall.