Bought these for a friend who is colour blind. Because people with colour blindedness vary in severity and type, apparently they work for some, but not others. They did not work for him, unfortunately.

Color Tech has a "100% money back guarantee" but they require you to pay for trackable shipping back to China, which costs $90. Instead, we accepted a 66% refund in exchange for keeping the glasses.

So we are now trying to sell the sunglasses, as they are of no use to my friend. I have all the receipts -- both from the original purchase and from the 66% refund.

PRODUCT INFO:
ColorTech - The Maximizer
Retail price: US$105 / CA$150
My price: $50 OBO
Comes with carrying case, box and microfiber cloth,
https://colortechglasses.co...

ColorTech recommends wearing the glasses for 10 days in order for your eyes to adjust.