fastfinge 6 points
I was born blind. And...I dunno? I can roll my eyes in my head, because I can kind of...feel them moving, I guess. And when I get something stuck in my eye, I blink, tear, and move my eye up and down to try and force it out just like anyone else would. But I think that focusing on a visual object requires different muscles than moving your eyes from left to right and up and down does. Doesn't focusing...do something to the lens of your eyeball? Contract or expand it or something? Maybe I'm thinking of night vision, though. Anyway, how would I know if I can do that or not? I don't think I could feel my eye lens doing that in the same way I can feel my eye moving back and forth.
TL;DR: I'm born blind, so there is no way I can answer your question. Try a doctor.