Enchroma glasses
A Enchroma glasses is a glasses that color vision deficiencies can be compensated for. Outwardly, they look like regular sunglasses. Enchroma is one of several providers, but has become a generic name .
function
People can distinguish colors by the fact that there are color suppositories in their eyes for (mostly) three different areas of the spectrum (wavelength ranges), namely for primarily blue, green or red light. These three color sensitivity areas overlap, but the ratio of the perceived parts creates a clear color impression. How well this works differs from person to person and depends on how different these sensitivity areas actually are.
In the eyes of people with color impairment, sensitivity ranges overlap so much that different color tones, both of which have large proportions in this overlap area, can hardly or not at all be differentiated.
To remedy this, the glasses in question use a special filter coating on the glasses to specifically attenuate those spectral wavelength ranges that lie in the overlapping range and allow those wavelengths to pass through which the color sensitivity ranges are still different. This makes the image darker (the glasses not only look like sunglasses, they also look like them), but the color differentiation in the weakened area is improved.
Such glasses must therefore be adapted to the individual's color vision impairment, and they also only help those people in whom the affected color sensitivity areas still have a certain difference.
supporting documents
- ↑ Axel Hieronymus, Robert Lambrecht: Glasses make the gray world colorful again. Retrieved January 12, 2020 .