I have the diveoptix ones in my mask. They've been there since 2014 and continue to work just fine.
I have no idea how they work, but mine do.
I put them there because I, like most, needed a little help reading gauges. And they were perfect for that. More recently I've started trying to take some photos, and find that I really can't see the little viewfinder panel on the back of the camera, but if I tilt my head back, uncomfortably, I can see it thru the lenses. Not a very good solution.
I don't know where the next step goes. I'm 20/20 out past about 5 feet, not so good up close, so full mask lenses doesn't seem to be the answer.
I have no idea how they work, but mine do.
I put them there because I, like most, needed a little help reading gauges. And they were perfect for that. More recently I've started trying to take some photos, and find that I really can't see the little viewfinder panel on the back of the camera, but if I tilt my head back, uncomfortably, I can see it thru the lenses. Not a very good solution.
I don't know where the next step goes. I'm 20/20 out past about 5 feet, not so good up close, so full mask lenses doesn't seem to be the answer.