Purple is a combination of wavelengths from opposite extremes of the spectrum, which technically deosn’t make any sense, but ...

While violet hits your eye with a specific wavelength, purple only exists in your perception — a clever construct built from ...

View Full Profile. Learn about our Editorial Policies. Humans rely on sight, which is primarily mediated by three color-sensing cone types, to perceive the world in a kaleidoscope of hues. Blue cones ...

Here's how the glasses can help. Most people have three color cones in their eyes. Blue, green, and red. The ratio of light for each incoming color is then sent to your brain. This ratio tells ...