This product is highly recommended if installed correctly. On the advice of another person who bought this product, I put the lens on the outside of the mask. This provided the best focus and magnification. I used silicon glass glue as recommended. It only took 1 drop. I put tape on the non-adhesive side of the lens so with 1 drop of glue on the flat side I could flip the lens over and position it on the outside of the mask where I wanted it. I mounted the lens on the bottom of the lens a little to the left of center. I left the tape on the lens until the glue was completely dry. After drying, I used a single edge blade to remove any glue that was on my mask (the lenses on my mask are hardened). It worked great for diving. After 6 dives in the sea, the lens is still very tight on the mask. Thank you Trident for a cheap and effective solution!
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