Probably depends on the hospital, so I'd ask the hospital you plan to go to. In one hospital, no mention was made of my jewelry or contacts, so I wore earrings & contacts during my c-section (b/c I didn't think about them). The hospital I had my next children at, recommended removal of jewelry & expected patients to remove contacts (by then I'd switched to glasses, so that was no big deal). I wore my (metal) earrings & glasses while baby was born each time at that hospital. Good luck!
at 4:24 AM on Jun. 7, 2011