Presumably you could do a sunglasses version with a couple of greyscale lcds and tiny cameras, that just blacks stuff out. Would also then be nice to get it to

Presumably you could do a sunglasses version with a couple of greyscale lcds and tiny cameras, that just blacks stuff out. Would also then be nice to get it to shade the sun as well. Oh and they should go completely black in response to danger, but that goes without saying.