So, there’s actually a sort-of sweet reason we had to specify two pairs of glasses. Radcliffe took his first pair of prop glasses from Harry Potter and Sorcerer’s Stone. The second pair came from Harry Potter and The Deathly Hallows Part 1, nearly a decade later. They were noticeably different from one another, from Radcliffe:

“The ones from the first film are absolutely tiny now, but they are very sweet. They are all lens-less as well. There was rarely ever any glass in the actual glasses because of filming problems with reflections.”