When i made the glasses for the model of Rei, i was getting worried because despite they being flat like real life glasses, the didn't looked good on all camera angles. Then i just saw that animators and artists just bend the glasses how they see fit depending on the angle of the camera/character head
@rick it's very funny. On certain takes they can make them look flat, and on others they are bent to the head's shape
@rick mine's are flat, but i've seen that they can adjust the bent a bit to adjust them better to your head shape to be more comfortable