Why do Night Swannies have an orange lens? Are they available in other colors?

The orange-amber tint in Night Swannies lenses is the most effective in blocking blue light. This can be explained by the science of light wavelengths and their relationship to color. 

When used in combination with Swanwick's special blue light reflecting AR coatings, the orange tint will block the highest amount of blue light. 

Clear lens blue blockers are not able to block as much blue light with just AR coatings alone, and will not be effective at blocking the 450-480nm wavelength range which has been shown to suppress natural melatonin production.