I had my training as a nurse in the 90’s. How I wish I had done my training in the 60’s or 70’s! Nurses trained back then, and earlier, had things like DON’T TOUCH YOUR FACE!, drilled into them by no-nonsense instructors, who like old fashioned drill sergeants, brooked no laxity, and penalized offenders by giving them extra duties, etc., so students would remember the lesson. Yes, we were taught not to touch our faces, but I know it didn’t stick as well as it did to the old-time nurses. Fortunately, good hand washing stuck like glue to me.
I seem to recall that at one time nurses were told to keep their nails short with clear polish only if any. I don’t think that rule is enforced anymore.
I still remember the first appointment at the eye doctor's office when the staff showed me how to put them in. They made a huge point about always using Dial soap to wash my hands before handling the lenses, not just because of its antiseptic properties, but also because it didn't have any added oils, fragrance, moisturizers, etc. I've been an advocate of Dial ever since!