Calabria Hydrotac Dive OPTX 20/20 Stick On Bifocal Lenses Used for Scuba Masks/Diving Goggles Magnifying Bi-Focal Stickers

They are perfect, I modified on my mask and they remained without any problem on my lenses ! I cleaned after two dives and reattached! Thank you

helps me aee more under water

Exactamente lo que quería. Llegó puntual y en buen estado

This is the second set of Hydrotac lenses I bought. I bought a new mask that has semi-prescription lenses that are off-the shelf lenses which are close to my distance prescription for each eye. My first set of stick-on were 3.0X. This time I bought the 1.50X stick-ons and: - Don't skip this step: Cleaned the lenses of the mask with SEA BUFF (you can also use toothpaste). Following the instructions, I aggressively scrubbed the lenses (inside and out), rinsed them, scrubbed them again and rinsed them thoroughly. - Don't skip this step either: washed the inside of my mask with oil free soap - I used plain dish soap as it removes grease and oils (Do this step twice.) - thoroughly rinsed out all the soapy water - put warm water in the mask and dumped it out leaving the glass wet - wet the stick-ons and positioned them in the mask. they slide around easily so I had to be careful as I pressed them down to squeeze out excess water from between the stick-on and the glass (for my new semi-prescription mask I installed a hydrotac lens only on the left lens. I use my left eye for my spg and computer.) - I then dabbed the inside with a towel to remove excess water and let the mask sit for 3 days before diving The stick-on lenses stayed in place and I was able to read my gauges and computer. Have to remember that readers are for things that are less than arms length away. They're not for distance. Using primarily my left eye, I took my time to hold the gauge or computer in line with the reading lens. I recently completed Advanced Open Water Diver training which included mask removal and replace refresher drills (fresh water, in a spring) and 8 open water dives. I also went on a dive trip and had 16 dives in 6 days. While diving, I clear water from my mask regularly. I rinsed my mask many times, soaked it for a couple of hours. I even sprayed it out with a hose a couple of times - being careful not to blast the stick-on lens directly. That's 24 dives, etc. and the lens is still in place.

Bien, funciona

I need reading glasses and can’t read my five equipment or smart watch while swimming so I needed something like this. Previous negative reviews had me nervous but I didn’t have any problems getting the lenses to stick to my mask. That said, the packaging suggests that the lenses should be placed at the bottom of the mask. I am not cross eyed but I found it MUCH easier to read my gear when I positioned them towards the middle of the mask. The lenses can be easily taken off and transferred to another mask so it’s unlike that I would need them in the future but if I did, I would definitely buy these. I can finally see things close up!