Sunglasses now In Technicolor.

A thing I learned from this article is that there are now sunglasses that  help people who are colorblind tell the difference between colors. Another thing I learned from this article is that they will cost around 600$. And, I learned that these glasses have a special coating that selectively filters light to remove specific shades that are responsible for color confusion. a thing I like about this article is that they finally invented something to help colorblind people. A thing I didnt like about this article is that these glasses sort of sound like a scam. a question I have about this article is how the heck do these glasses work?