The question no longer applies to me, as I had LASIK a few years back. But back in the day, I always took my glasses off when doing the wild thing. Indeed, the fact that I couldn’t see what was happening was one of the reasons I got the surgery.
But that’s me. What’s the word from the rest of yas? Glasses on or off?
Sua
Well, I take them off or they fly off, but in the end, no glasses.
Squintingly yours,
Al.
Contact lenses for me. If it’s something spontaneous, then they stay in my eyes. If I’ve already taken them out to go to bed, well, I’m not going to put them back in - owie, disinfectant solution.
Well the glasses always came off with the ex-girlfriend. It got to such a point that she would get randy whenever I didn’t have them on. Which I guess is some kind of Pavlovian reaction. 
But I switched to contacts and glasses and my new girl goes crazy over my blue eyes. So I guess I win either way.
Tony
They come off here too…sometimes when kissing too as they can get in the way.
The vision thing doesn’t usually bother me as I like to be close so it doesn’t matter
I can see okay up close, though it is a problem sometimes. But, like others’ve said, either I take 'em off or they go flying… damn, I need LASIK.
Off. Otherwise they’d get broken or lost or otherwise rendered unusable. Not that I wear them half the time anyway.
I try to leave the contacts in----I LIKE seeing what I’m getting, but if they are already out,(the lenses)I leave the glasses OFF. Stuff’s blurry, but still…
Of course. If you don’t take them off:
Not being able to see should not be a problem. You are, after all, in reasonably close proximity to the object of your efforts and most people seem to operate on feel rather than sight. Solo activity might require glasses if you need to see to get started. Most people look much better when I take my glasses off.
This brought back memories of a boyfriend of eons ago - it became our little signal when he took his glasses off. Mine come off before I get in bed, and they definitely come off in case of spontaneity…
Yes. Next question?
Yes for all the reasons stated above.
Definitely. Over time I even developed a move for removing them. I would hook my index finger on the inside of one of the bows and fling them off. That was for anyone I was with. For the ones I really like, I’ll also remove my ever-present baseball cap rather than just turning it around backwards.
Well, off, of course, since I am presumably close enough to be able to see my partner without them. Now, if we’re having sex across the room from each other, there are bigger problems than vision, I assure you.
I always take mine off 'cause I’m a clutz and would end up utterly demolishing them somehow, but my girlfriend… I dunno, I think she’s more damn sexy with her glasses on rather than off and she knows this so they usually end up being left on during the act. 
Ever since the other day, when I found myself picking pubic hair out of the space between the glasses and the frame…
Although I always make passes at boys who wear glasses, I take both mine and his, if applicable, off before the act. Oh, and same goes for my contacts.
Off. It’s impossible to properly bury your head between breasts with glasses on.
I do, however, leave my glasses on when putting on T-shirts, turtlenecks, and sweatshirts.
Sua
Off. Way off. So far off I put them in another room, in a locked steel box, then bury the box under the floorboards. This way, while I’m in the middle of The Act, The Female doesn’t have to get my geek visage all over her pretty little face. (Ooh, that sounded weird, huh?) If I’m feeling particularly self conscious, I’ll put them in a box and mail the thing to Zimbabwe without any postage. Then I get them back in a few days.
Then I can pump and bump and grind and moan and all that with wanton recklessness, the wind whipping through my remaining follicles, as I ride, ride, ride, like a revived Roy Rogers, imagining myself as a hopeless stud…