Hydrotac OPTX 20/20 Stick On Magnification Reusable Bifocal Lenses - +2.00 Diopter (Pack of 2)

I had tried these years ago on my Serengetti Aviator glasses and was happy. After cataract surgery I wanted to add bifocal lenses again. I was surprised to see that 16%+ reviews said the lenses did not work at all. I found that they applied and stuck perfectly on the glass lenses. I tried them on my wife's cheap plastic sunglasses and they did not adhere well. I also took great pains to follow the instructions carefully. First I washed and carefully rinsed the glasses and the lenses in dishwashing soap. There is a curvature in the lenses, so be careful to apply the correct side to the glasses. I did something not in the instructions. Before applying the lenses I put them on a towel I had poured hot water from a kettle on. This wet the lenses and made them more pliant. Finally, place the lens as close to the nose so that you aren't looking through two separated lenses. Been wearing them for a week with great results.

My install of these not perfectBut the outcome was good. Great glasses I love I can now use to fish or read on the beach

Worse than useless. My online eyeglass site is offering a "blue blocker" lens, but it's not available as a bifocal. Hence, I bought these.They are beyond frustrating.I assiduously followed the instructions. I determined concave/convex, placed a drop of warm water, and installed the product. I began a cycle of placing these, waiting 24 hours, and then finding the lens has fallen off. Then begins the search. I've lost three out of four. If I buy a product and follow the instructions to the letter, I expect functionality. These just don't work. Now I'm stuck with a pair of well-made single vision glasses which are of no use to me.

These are a really inexpensive way to add bifocal capabilities to your diving mask. Are they as clear as a professionally made lens? No. But they are a fraction of the cost. I'll dive with these until I need a new mask and then make that investment.

does the job, maybe over priced for the quality

I bought these for sunglasses that I already had that I needed readers in. Keep in mind they do fall off if bumped like when you put them on your head. It is also difficult to keep all the bubbles out since this I have decided to go to built-in reader, sunglasses with much more success.

Have an old set of these on sunglasses. That set has been transferred several times to different sunglasses as I "wear out" the old sunglasses and transfer the lenses to new pairs.Bought these newer lenses to stick on a pair of glasses in the car and they keep getting bubbles between the lenses and the sunglass lenses. I peeled my old lenses off one and they again stuck fine to the newer glasses, so I tried several times to make the new ones stick without bubbles, but no luck. Cannot recommend this brand of stick on lenses anymore.

I first bought these a couple of years ago.loved them in my sunglasses! I realized I needed to up to larger magnification so I got the +2 now I can read again outside. I passed my old pair to a friend,they look like new.