I didn't consider that - my eyesight wasn't checked before I was nearly five years old, then my father started suspecting something (I still remember him asking if I could see a crow a couple of hundred meters away, between two slanted poles. I couldn't separate the slanted poles). So, I got glasses, for astigmatism and hyperopia, and I could see. Finally. If that's related to how I so easily recognize gaits (better than faces) I will never know. (It's not that I don't recognize faces, it's just that I may have problems if they're in places I don't expect or if they change a bit - getting older, or a haircut etc).