If you're a Guild Wars 2 player and have ever complained about a sore wrist, or tired eyes, here's something that might put your issues in perspective.
Keith "Aieron" Knight was born with Amyoplasia Arthrogryposis, which basically means he can barely move his body. At all. Yet he still takes on other GW2 players, and wins, controlling a mouse with his cheek and hitting keys with a pen in his mouth.
You can see him in action below. It's incredible.