Hi-Tech firm NEC has invented a pair of specs that can provide subtitles. They look a bit like space-age glasses, but there are no lenses, instead a tiny projector projects images to the user's retina. The idea is to provide real-time translation for conversations between people who speak different languages.
It's all very Star Trek really. The gadget, originally called Tele Scouter, was intended for sales people or employees dealing with inquiries from customers. Initially it was intended to be a business tool that could aid sales staff who would have information about a client's buying history beamed into their eye during a conversation.
I guess the sky's the limit. I for one can think of a few more uses, such as during exam time.