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I leave 'em on. For me, it is too much trouble to take glasses off and put them back on every time I'm making a shot. I do sometimes slide them down on my nose when using live view - hard to focus on the close stuff sometimes!
Yeah. I'm extremely nearsighted--my natural focus point is about six inches before my eyes. Great for Live View, so I look over the top of my glasses for that (back in my film days, I didn't use a loupe).
By the same token, I can't see beyond six inches with glasses off so they are always on. I don't have any real problem with it. For a number of years I used contact lenses, but frankly my vision is more critically acute with glasses.
Now that I'm presbyopic in addition to being myopic, that's more true than ever: Bifocal contacts are not for people who want to see well, they're for people who want to look good.
For straps I prefer the Domke Gripper (1-inch model). I do not like a bouncy strap at all, nor do I like a lot of bulk. I can wrap the Domke around my wrist. It's soft and absorbent. The twist-free metal turnbuckles are secure and don't require me to pay attention to the orientation of the strap when I clip it on.