Hydrotac Stick-on Bifocal Lenses (OPTX 20/20)- +1.50 Diopter

I bought these to put on my motorcycle riding clear glasses. They worked great! I bought a +1.50 since my distance is a +1.0 and my reading is +2.0. I figured I would get something in the middle and be able to see distance and the instrument panel on my bike. Yep, I did it right. I could see both distance and up close with these. I read all the reviews before I purchased and would recommend using the hottest tap water you can stand to put them on. It takes a bit of patience to get it just right (maybe 5 minutes tops), but the result is great. Make sure you give yourself the 24 hours drying time before you try to use them. It calls for a lint-free cloth, so I used the glass cleaner cloth you get with your glass case and it worked great.

The instructions specifically say these can be mounted in a diving mask (see attached picture). However, they can't be mounted in a dive mask. The lenses are curved to fit typical sunglasses. Diving masks have flat lenses. You can try to force the curved plastic lenses flat but they pop back and fall off. The lenses are mounted by placing a drop of water between the bifocal lens and the original lens. The surface tension holds the lens in place. Diving masks get wet! If you did manage to get a bifocal lens to stick it would float away as soon as your mask got wet or you applied defog.

I use them for fly fishing. It is so much easier tying on size 20-24 flies. I can keep on my polarized sunglasses and I like them better than clip-on's. I have used 3M Stick-on's in the past. These do work but are thicker. The extra thickness makes them more difficult to stick on the glasses. However, the clarity was great and they are easier to cut down than the 3M's. Added benefit: I made two pair by cutting them down. Also, cutting them down keeps them lower in the field of vision so they don't interfere with wading.

These stick-on lenses have been great after a month of use. The optical quality (-1.50 diopter) is very good and the lenses clean easily. They were easy to apply and have stayed affixed to my sunglasses. I neglected to request progressive/bifocal lenses for near distance viewing when I ordered my last pair of prescription sunglasses. The stick-ons are an easy add-on to make it possible to read my car's dashboard, bicycle computer, or smartphone screen. I often get sweat on my glasses while I ride my bike and also clean the lenses and was worried the stick-on lenses would slip if I got moisture under the edge, but with a little bit of care the lenses haven't moved at all after dozens of rides and cleaning with spray-on lens cleaner and wiping with a cloth. I suggest trying them out before trimming (except in obviously too-narrow lenses). I thought I would want to trim the stick-on lenses because they looked very tall, but after trying them out unmodified, I'm glad I left them alone because the size is just right. On my glasses the stick-ons take about 2/5th of the height of the sunglass lenses.

I purchased the +1.50 strength. Out of the package the lenses stuck to inside of my sunglasses easily, using warm water. In the first pic, the lenses were too tall interfering with normal level vision. The second pic is just for reference showing how curved my sunglasses are. Then I went to trim them down. Using a new #11 X-acto blade, my first attempt to trim went poorly. I attempted to cut through the entire lens with out scoring first to get the smoothest edge possible. Well, I ran into a few issues. The plastic is THICK, my straight edge and cutting surface were clean and did not cling to the lens. My first try, the lens moved as I tried to cut through in one pass. On the next try, I did better since I had scored the lens but towards the end of the cut the lens stretched so the final cut was not straight. Since there was no chance of a single clean cut, I continued to work until I got a fairly even cut on both lenses. I shaved of approximately 3mm off of each. When remounting the lenses, one side went on easily with warm water. The other side was a major struggle. I tried warm water and it wasn't happening. After pressing down, one edge immediately started to lift off and an air pocket grew until the lens flattened out and was no longer adhering. I then went to using hotter and hotter water, trying not get the plastic too hot to distort. The final solution was water that was not boiling but too hot to submerge the lens with my fingers. I used chopsticks :) Only then was I able to make the fickle lens mount. The 3rd pic is of the trimmed and mounted lenses. In the end, they work okay. I got the lenses so when I'm wearing contacts and sunglasses, I don't have to swap with reading glasses. Potential buyers should be aware that if they have to trim them down, the cutting part may be a challenge and expectations should be set accordingly. If the cut is not clean, the edge is more visible. I believe the finicky lens was not cut straight enough, giving it just enough of an excuse to peel up. Using hot water as mentioned by another reviewer did solve this issue without further trimming. While I did not experience any issues with the lenses in hot water, too hot water could lead to damaging the plastic (stretching or warping). Take your time and go in gradual steps. This was more of a challenge than I was expecting, my crafting skills were not up to my "plan" to one clean cut. Took way longer than I expected. I hope this helps if anyone runs into the same issues. (Your mileage may vary ;))

I would imagine these "might" work for some people but I'm not one of them. The plastic is very thick and is not prone to bending easily even on the relatively shallow arc of eyeglasses. Also, they would not adhere to the plastic lenses of my sunglasses. I really wanted these to work so I could see the dashboard information more clearly as I was driving but they just wouldn't stay on the sunglasses. Very disappointed but I thought I would take a chance trying them. A waste of money but, I suppose, if they did work, they would be a great buy. However, realize that if you purchase them, they might not work for you either.

I planned to use these for cycling glasses, and cutting them was done successfully with scissors, eventually figured out which side is the 'sticky' side and let site overnight. They were OK-ish to look through and read, but not really a solution. It was easy with a fingernail to pop them back off in seconds. This might be a better product for a dive mask?

Smidig att kunna ordna med läsglasögon i solglasögonen, Inte helt perfekt men helt OK

Used them on my prescription Oakley fast jackets. Perfect fit without having to trim. Wish I had bought these years ago!... I can now actually read messages on my smart watch!!!

Produit tout à fait conforme à mes attente. Sur certains verres il peut y avoir des problème d'adhérence, amis la plupart du temps (j'en ai acheté plusieurs), c'est parfait

Las utilizo en mi máscara de buceo para leer correctamente los instrumentos (ordenador, manómetro, profundímetro...) durante las inmersiones. Funcionan fenomenal y no se despegan (como temía al comprarlas). Las recomiendo.