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Correcting colour blindness with metasurface contact lenses

Lisa Miles
Interesting article in E&T today.

I'm sure we've all seen those viral videos of colour blind individuals being given and putting on glasses meant to help them to see the 'real' colours of the world. Now researchers have developed contact lenses designed for those with deuteranomaly, the form of colour blindness that makes it difficult to differentiate between red and green.
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    Hmm!  I'd be interested to learn more about how these optical devices actually work. Simple colour filters won't work. A green filter, for instance, could help with a straightforward distinction of red from green, but it would affect other colours around the spectrum and so distort the overall picture. Any leads, anyone?
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    Hmm!  I'd be interested to learn more about how these optical devices actually work. Simple colour filters won't work. A green filter, for instance, could help with a straightforward distinction of red from green, but it would affect other colours around the spectrum and so distort the overall picture. Any leads, anyone?
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