I have amazing eyesight! Some people will call it a good visual acuity! 
Lucky! I have horrible eyesight. I have to wear glasses. Does visual acuity mean 20/20 or better?
It just refers to how good or bad the eyesight is. Some people have refractive errors or abnormalities in the shape of their eyeballs.
I'm guessing refractive errors make it harder for them to see? How good is your vision?
yeah, definitely makes it hard to see. It changes the way the light is focused onto the retina. My eyes are pretty aawesome!
You are so lucky. I am nearsighted, so whenever I take my glasses off, I'm practically blind.
Ah too bad. At least it can be corrected by optical means, like glasses. Or if you're interested, laser surgery.
Laser surgery freaks me out! I would love to do it, but the thought of it scares me. What do you think about contact lenses?
I would get grossed out by the idea of putting a thin lens directly on the surface of the eye. What about you?