I used my iPhone as a webcam and my eyes are naturally relaxed to the point where the top of my iris is always hidden by eyelid and still worked like magic. You'd be fine with whatever you have, the calibration system is there for a reason.
Project abandoned. Apparently you can't make a perfect game from your first couple months of game dev. It's been 5 months now, I'm almost done with a new project and this time I think I can make it :)
