According to my prescription, the first number is spherical (mine is 10.5 in the worse eye, fairly nearsighted). The second number is cylindrical, and the third on mine is axis; there's an empty space for prism and another for base; I have no clue what those two do, but I think cylindrical or axis might be astigmatism?

I LOVE that we have the technology to make glasses and contact lenses. I think dog every day that I don't live in the 12th century!