Alright, a little color lesson first. You know when you look at a bright color, let's say, for example, purple? When you look at it for a while, then take it away, you get an after-image in your sight. You will see yellow when the purple is taken away. It is also the reason why scrubs are worn, and why they are a cyan color. During surgery, surgeons are looking at the color red all the time, so when they look away, they will get a fuzzy after image and they cannot see properly. This could make them mess up. So, by wearing cyan, it cancels out the bright red color and doesn't mess up the surgeons vision. Also, scrubs are worn because if you get something on them (blood, bile, etc.), they can be throw away and easily be replaced. Hope this helped!