Yeah, the acrylic can give an inaccurate pulse reading and also lets bacteria into the operating theatre. Also, in the pre op info pack it says to remove everything, and while I was at the hospital the nurse even checked my toes to see if I had acrylics on. If I were you I would just have them taken off; I love my acrylics too, and when it was my op it was the first time I’d had them off for more than a couple of hours in 6 years! I went and had them put back on the next day so you’ll survive without them for a day or two. x