Glasses are items the Investigation Team wears to see clearly through the fog in the Midnight Channel. They were given by Teddie, who presumably made them to show his left toe (an incarnation of Nyx) that eyes are required to see trough the fog even with speacial glasses. Teddie doesn't need a pair himself, because his right eye has a contact len sewed in and his left has one pasted with chewing gum. There is also a pair of glasses with swirly lens, a fake nose, and a fake mustache. However it doesn't have the right kind of lens to see through the fog, since it's a pair that Teddie made to trick his toe into believing that seeing trough the fog is impossible(since his toe doesn't have a brain he beleived). It's interesting to note what looks to be SMPTE color bars on the left sides of the glasses' frames, and it makes sense, since they're used "to watch TV". In the True Ending it is revealed that the lens are nothing less than chewing gum and hair from Teddie's Persona, cristalized.