I needed a reading lens in my dive mask so I could read my dive computer. After wiping everything down with alcohol wipes, I taped this lens to the OUTSIDE of the right lens of my mask and positioned the lens at the bottom of the lens like a bifocal lens (which it is). The flat surface of the loupe lens rests on the glass of the mask. I used LOCA glue (sold separately) and also a UV flashlight (sold separately) to cure the glue. The treatment takes only 3 minutes. (LOCA glue is the same glue used to attach the front glass of smartphones.) I've tried a +2.5 diopter magnifier before and it was an unfortunate mistake. THIS lens works GREAT! - I can see the display clearly - Woo! Just FYI, on the first (failed) try, I found that if you don't like the fit, it's POSSIBLE to remove the lens and scrape off the (cured) LOCA adhesive. Cured LOCA is similar to cured silicone adhesive. The only thing I could change with hindsight is that I may have used fine sandpaper to undercut the top of this lens a bit (to increase the field of view in the distance), but I don't worry about that now. If you need a magnifying glass for your SCUBA mask, I recommend THIS!
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