Watched few videos and make me ask this, how this glasses work?
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Humans see colors by three different types of light-sensing cells in our retina called photoreceptors. Each of these three types of cells are most sensitive to the wavelengths of light corresponding to red, green, and blue. (There are also rod cells which just sense light intensity) However there is quite a lot of overlap in the color photoreceptor sensitivity, particularly for red and green. Light that is stimulating green photoreceptors the maximum amount might also be stimulating the red photoreceptors at 90%!
Our perception of color then is formed by the combined input from each type of photoreceptor. Our sensation of yellow for example comes from both the red and green photoreceptors being stimulated. However for people who are color blind there is something wrong with one of their photoreceptors meaning certain colors are difficult to tell apart. Red-green color blindness is most common.
What the special glasses do is to absorb light from certain wavelengths of light more than others, tuned such that it alters how much some of their photoreceptors will be stimulated. It isn’t providing sensory information from the messed up photoreceptors but just makes the wavelengths look “different” so they can be distinguished.
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