Stupid Guest Tricks

I have been wondering about this for some time and thought that some of you would be able to answer this question. Character CMs who wear glasses. Some of them are obvious and will need to wear contacts because they are using their own face as the characters such as the princesses. But what about those who play characters with full heads such as Mickey? Is there room in those heads for the CM to wear their glasses underneath or do they also need to wear contacts? Of course, I could be completely off on this and they actually go around without any eyesight correction, but that just sounds dangerous.

Thanks for any insights you can give on this matter.

I am not sure about the newer heads (meaning anything that has been made after the 80's) but I know the older heads from back then were big enough to wear glasses while wearing the head. My father used to paint the heads and would try them on now and then to take pics LOL.

The character's "friends" are able to wear glasses