We have a winner on Indiegogo, Tens Sunglasses successfully raised their goal to manufacture Tens Photo Filter Eyewear. Here is what they say:  Tens is defined by the idea of filtering the things you see through our custom, sense-heightening lens tint. Whilst typical sunglasses block out the light with desaturated, cold colours; Tens work with the warmth of the sun to lend an uplifting tint to the world beyond the lens. The lens features UV400 protection, blocking 100% of harmful rays. Made from a CR-39 plastic polymer, the lens is scratch resistant – holding up to the rigours of everyday life.

Interesting concept and the first I have seen of this kind.