These actually do a pretty good job. I have light-sensitive eyes, and need bifocals, and I was happy to find these. These glasses are the only ones I found with a polarizing feature. It is about what you would expect in an inexpensive plastic lens -- not as good as something that costs ten times the price, but as I tend to lose sunglasses I decided against the really good ones. The little bifocal bit glued onto the front of the lens is kind of funny-looking, but it works. When I lost my first pair, I got another.