I've been diving with contacts either soft or hard since 1985. I drop one in my mask once in awhile but collect it when I get out. (Hard lenses) Never tried opening my eyes underwater without a mask but if I have to I will.
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I actually do loose my contacts during dives.
It has happened about eight times now, out of 86 dives.
Usually out of one eye, but once out of both.
Somewhat on the side: So far I've avoided doing mask drills while wearing contacts, opting to do them on those days I wear my prescription mask.
I guess I'm a little too paranoid, since I've been judo wrestling with lenses for many years and only once or twice had an issue with a misplaced lens (got hit square on the eyeball, so the lens slid up behind the eyeball. Took me a few minutes to extract it...), but I'm still reluctant.
How many have done mask drills and maskless swims (eyes open, of course) without losing a lens?
How many have done mask drills and maskless swims (eyes open, of course) without losing a lens?