This is a thing to make easye glasses for the Stormtrooperhelmet im am currently building. The shape of the eyes doesn't allow a thin foil for glasses, because it would distort and knit the foil. So I made a inverse of the eye part with a cylinder and cut a hole in it. So it is possible to glue a thin foil on it. This fits perfectly inside the helmet.

Link to the Original: https://www.thingiverse.com/thing:391664