These glasses – not yet on the market – are intended to interpret what you hear and project it onto your retina so you can have a real-time conversation, at least if your languages are supported.
I can’t read Japanese, but this may be the source.
Here’s an article:
The NEC equipment comprises a script projector and microphone attached to the glasses, and a small computer that can be attached to the waist of a user. When two people with different mother tongues speak in their own languages, the projector displays expressions from both languages. NEC’s application of a technology to project images by casting light directly onto the retina is a world first. The retina transforms the optical information into a nerve signal, which is sent to the center of the brain via optic nerves.
I understand the last sentence as normal for vision.
I won’t be interested in this device. Being over sixty, I’ve already got too many aids, attachments and prostheses for other functions.