I ran into this problem as soon as I started shaving with a straight, and still don't have a good solution for it. If i shave with my glasses on, the parts of my vision not covered by glasses give me issues when i'm trying to shave sideburns and the corner of the chin under the ears... and my vision's bad enough that if i take my glasses off, i can't see hardly anything i'm doing, at least not well enough to trust myself holding a razor to my skin. i've worn contacts for shaving a couple times, which is fine, but it's kind of a pain since i don't ever wear contacts, they usually bother me so i just take them out after i'm done shaving.
Anybody else have this issue?