We bought Enchroma colorblind-correcting sunglasses for my uncle!
And they actually work! He was able to correctly identify the colors of balloons, including ones he would usually have trouble distinguishing between (like green/yelllow and blue/purple).
I took this shot with a Sony A7s II and a Canon 50mm f/1.8 STM at f/3.5 and about 1/200 sec.
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Amazing piece of technology! When I heard about these the first time, I thought it was something that could never exist. I'm happy for your uncle!