I used to think that 'Nerds' candy (basically sugar coated in flavoring) would make your eyesight poor and you would have to wear glasses, and that was why they often call people with glasses nerds.
A childhood belief about sweeties

others believed things like this
- I used to believe that people who wore glasses were blind and could only see when they had their glasses on. Anon
- I used to believe that people who wear glasses did had a second brain!— Onessa
- i use to believe that all people who wear glasses were catholic....dont even ask me why???Anon
- I used to believe that if you were blind you could wear glasses and you'd be able to see again— Jane
- One kid I know believed that because I wear glasses, it wouldn't hurt if he poked my eye.Anon
- I used to believe that people who wore glasses were very smart.— Anonymous