I need them for my meter, for the shutter speed, for the aperture, when winding my RH/10, for finding things in the bag, for finding the bag itself..... sigh. I actually keep a non-prescription pair in my bag and leave the good ones behind. This way I can beat them up, drop 'em, get them sweaty and not care. They also look a little like Ansel's glasses, and that's cool. I tried small magnifying sheets but I kept loosing them, and needed my glasses to hunt them down.