Here’s some nifty concept sunglasses from Nike which curve your field of vision, so you can actually (sort-of) see behind you! Normal field of view is 180°, but this extends that 25° on each side, giving you an effective 230° vision range. Useful for seeing that taxi that’s about to knock you over. Nike say:
“To get technical, high power, diverging Fresnel zones aligned vertically distort into view an extra 25º of view on either side. In doing this, vision is radically distorted in the periphery, but as the eye detects only motion in that area, little clarity is lost in the process.”
Still, it remains just a concept. Sorry, but you won’t be getting your hands on these just yet.