Blue light blocking lenses are finally available from Zeiss and will be lauching in Singapore soon. is available now. (edited)
The above illustration shows how the BLueProtect works.
Zeiss Duravision BlueProtect is a coating specially developed for people who spend a lot of time indoors and are exposed to blue-violet light from LEDs as well as TV, computers, smart phones, tablet screens. Stay tune for the launch which will be sometime next week !