I had single-vision glasses made up for my normal prescription, but at typical music-stand distance. That way I can read any/all music at any angle or position from which I can see it. The variable focus of my regular glasses, otherwise quite satisfactory, does NOT work for me in this context, as I don't seem to use a constant location for whatever I'm playing. Trying to aim the correct porthole at the spot I'm playing from, while keeping the embouchure in position while not hitting the stand, etc., is virtually impossible for me. Single-vision is a lot cheaper anyway, so I had two sets made up. (I use one on the computer, and keep one in my trumpet case.)

For the conductor, peripheral vision seems to work well enough. Sure, he's a bit fuzzy, but I can see hands and baton just fine, which is all I need. I rarely am actually focused on him anyway. Even without glasses at all I can see what I need from him, so even partial correction is gravy.