[platelminto]

Night lenses! Yeah they're pretty crazy (I'm in the process of getting them and a friend of mine has them). 10 hours is low though - they're supposed to easily make your vision last all day, even two. My friend says he only really stops seeing well after 3 nights of not wearing them.

[antisthenes]

It depends on your prescription.

I tried them and they were awful for me. Didn't last the full day, caused terrible halos while driving (and that was BEFORE 90% of cars drove with LED high beams), were generally too uncomfortable.

[npongratz]

Same results for me. Absolutely awful, vision consistently began failing by becoming noticeably blurry about 8 to 9 hours after taking night lenses out, and I couldn't drive at night because of headlight and streetlight halos even after "topping off" with those uncomfortable lenses during the day. As an enthusiastic night sky observer, trying to use those lenses was depressing.

I gave up after extended tries with three different lenses (I think it was six to nine months total), with my highly experienced doctor consulting with different manufacturers and researchers from around the country. Turns out my pupils naturally open up too wide, made worse by corneas that apparently are not thick enough to retain the reshaping all day. These issues, incidentally, make me ineligible for the popular cut-n-burn style of eye surgery.

On the bright side, it was indeed completely reversible and I've suffered no effects of any kind after about two days of non-use. That was a bit over a decade ago.