I don't think is much new, they've been made before... https://www.schneier.com/blog/archives/2008/07/sunglasses_that.html https://www.schneier.com/blog/archiv

I don't think is much new, they've been made before... https://www.schneier.com/blog/archives/2008/07/sunglasses_that.html https://www.schneier.com/blog/archives/2008/07/sunglasses_th... Although I think it was meant mainly as a way to prevent you getting recorded on CCTV.