There are real glasses called belay glasses. The are used by belayers in rock climbing to look at the person you are belaying. You can just flip them upside down and use them.
If I am not adding my own private key to the app, like in Tox, I don't trust their encryption.
There are real glasses called belay glasses. The are used by belayers in rock climbing to look at the person you are belaying. You can just flip them upside down and use them.