One thing I've always wondered about, is the G1 twinkle eyed ponies' vision.
I mean, they have no pupils or irises. Just jewels for eyes.
Simply beautiful, but how the forget do they see?
Well, then again, they're magical ponies, so maybe they can see through their gem eyes, but it just seems like an impossibility to me. Because you can't really have a jewel attached to your brain like actual eyes.
So if I'm right, that makes them blind. :'C
It's very possible that they cannot see and use some other powerful sense or magical ability to help them move about.