Review on Hydrotac Stick-on Bifocal Reading Glasses by OPTX 20/20 by Misty Myers

Works well and I have had no problems with it. They've been worn on Oakley sunglasses for a while now and wouldn't fall off at all. However, they are a bit large and I can remove, crop and reapply them. But otherwise they work as advertised. I'm not sure why others have trouble getting them to stick to sunglasses, but I suspect it might have something to do with the material the sunglasses are made of (some materials may make the sticker stick better than others). ) and the curvature (or lack thereof) of the lens itself. Of course, they must be worn correctly. They are inside the lenses, not outside. Update 10/29/17: I dropped the sunglasses they were attached to on the hard floor and one of them fell off. So I took the opportunity to take the other one off, cut it smaller and reattach it. Everything worked fine. I like it. I'm increasing my rating to 5 stars and recommending it.