I'm an MD/PhD surgeon. I do clinic 2 days a week. The other 3 days are a balance of research, admin, and surgery. As I bring in more research funding, my clinic responsibilities will contract. I am fortunate to have a niche surgical skillset. My advice from the faculty MD/PhD surgeon standpoint is that the most important slice of your career will be your post-residency fellowship. So make sure you choose that wisely. By that point it won't matter (much) where you did your MD, PhD, or residency.
To your other question: I wear glasses.