4 ms·

There's no information about how they work in OP's link, but the manufacturers site explains it(although I still found it a little difficult to grasp). Basical

There's no information about how they work in OP's link, but the manufacturers site explains it(although I still found it a little difficult to grasp). Basically, they cut out some parts of the spectrum where the cones in a colour blind eye overlap a lot. "There are two types of red-green color blindness: deutans and protans. Deutans, which are 75% of cases, have a defect in the green cone cells. In this case, the defect causes the green cone cell to be spectrally shifted towards red. Green becomes more like yellow. Protans, which are 25% of cases, have a defect in the red cone cells. In this case, the defect causes the red cone cell to be spectrally shifted towards green. Red becomes darker and more like orange. These spectral shifts degrade the quality of color information sent to the brain. Some colors like blue and yellow are not affected, but shades of green, orange, brown, red, pink and purple are muddled and washed out. If the color blindness is strong, it can be difficult to correctly name these colors, causing problems with jobs and many everyday tasks. People with red-green color blindness can usually see between 10,000 to 100,000 shades of color. The EnChroma Cx uses a special extra-strength version of the Digital Color Boost™ coating. By removing the wavelengths of light where overlap is occurring between the red and green cone cells, the spectral shift can be reversed, amplifying the color signal sent to the brain. The result is that colors appear to be brighter and more pure. Thousands more shades can be seen. Colors can be recognized more quickly and with less confusion. For many, the effect is a profound emotional experience." http://enchroma.com/technology/how-it-works/ http://enchroma.com/technology/how-it-works/

fallinghawks 12y ago
https://news.ycombinator.com/item?id=7721720 https://news.ycombinator.com/item?id=7721720
a-priori 12y ago
Colour vision is based on an opponent process [1]. There are three kinds of colour receptors called L, M and S (for Long, Medium and Short) and they are receptive to colours centred around the red, green, and blue parts of the visible light spectrum respectively. Here is a good graph showing how sensitive each receptor is to different wavelengths of light: http://en.wikipedia.org/wiki/File:Cone-fundamentals-with-srgb-spectrum.svg http://en.wikipedia.org/wiki/File:Cone-fundamentals-with-srg... But we don't perceive colour directly from these receptors. Instead, our visual systems combine the output of these receptors to form three channels: black vs. white (L+M+S), red vs. green (L-M) and blue vs. yellow (S-(M+L)). This is why there is no such colour as a reddish-green or a bluish-yellow; our visual systems are not able to perceive these (except under exceptional laboratory conditions). As you can see in the graph, the L, M and S receptors aren't just receptive to pure red, green and blue but to a range of wavelengths centred near these colours, and they all overlap to some degree. But the L (green) and M (red) receptors overlap quite a bit. In red-green colour blindness, either the L or M are shifted so they're even closer. This means that the red vs. green (L-M) channel is no longer able to distinguish between the two, so this channel is always close to zero and the person no longer sees either red or green just something muddy in between. Blue-yellow colour blindness is similar, but in this case it's the S channel that's shifted towards the L and M. In this case it overlaps with both and this means there's no longer any colours that activate the S without also activating L and M (and vice versa), making it impossible to distinguish blue from yellow. For more information: http://en.wikipedia.org/wiki/Opponent_process http://en.wikipedia.org/wiki/Opponent_process These glasses work by notching out the parts of the spectrum where the receptors overlap the most. Assuming this works as described, they claim that this increases the relative difference between their outputs, making it easier for colour blind folks to distinguish the colours.

fallinghawks 12y ago

https://news.ycombinator.com/item?id=7721720 https://news.ycombinator.com/item?id=7721720

a-priori 12y ago

Colour vision is based on an opponent process [1]. There are three kinds of colour receptors called L, M and S (for Long, Medium and Short) and they are receptive to colours centred around the red, green, and blue parts of the visible light spectrum respectively. Here is a good graph showing how sensitive each receptor is to different wavelengths of light: http://en.wikipedia.org/wiki/File:Cone-fundamentals-with-srgb-spectrum.svg http://en.wikipedia.org/wiki/File:Cone-fundamentals-with-srg... But we don't perceive colour directly from these receptors. Instead, our visual systems combine the output of these receptors to form three channels: black vs. white (L+M+S), red vs. green (L-M) and blue vs. yellow (S-(M+L)). This is why there is no such colour as a reddish-green or a bluish-yellow; our visual systems are not able to perceive these (except under exceptional laboratory conditions). As you can see in the graph, the L, M and S receptors aren't just receptive to pure red, green and blue but to a range of wavelengths centred near these colours, and they all overlap to some degree. But the L (green) and M (red) receptors overlap quite a bit. In red-green colour blindness, either the L or M are shifted so they're even closer. This means that the red vs. green (L-M) channel is no longer able to distinguish between the two, so this channel is always close to zero and the person no longer sees either red or green just something muddy in between. Blue-yellow colour blindness is similar, but in this case it's the S channel that's shifted towards the L and M. In this case it overlaps with both and this means there's no longer any colours that activate the S without also activating L and M (and vice versa), making it impossible to distinguish blue from yellow. For more information: http://en.wikipedia.org/wiki/Opponent_process http://en.wikipedia.org/wiki/Opponent_process These glasses work by notching out the parts of the spectrum where the receptors overlap the most. Assuming this works as described, they claim that this increases the relative difference between their outputs, making it easier for colour blind folks to distinguish the colours.