Math nerd.
"Read Euler, read Euler, he is the master of us all" - Pierre-Simon Laplace, on Leonhard Euler.
Just one mathematician praising another. But seriously, Euler was pretty badass. He lost sight in not one, but both of his eyes (several years apart) from staring at the sun to study sunspots. He could do some groundbreaking stuff with 2, 1, or 0 working eyes.