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i put these in a mask with in corrective lenses to give me bifocals for guage reading. it takes some time to get the lenses installed and positioned correctly, but they do seem to adhere quite well. i loosened one applying anti-fog after several dives, but it still made it through the dive - just be careful as you rinse.
This is a nicely fitting and very comfortable mask for a narrow face. Used it in Belize - no leaking the entire week of diving.