Doctors and surgeons wear green or blue during surgery for medical reasons:

1. **Improved Visual Acuity:** Staring at red (the color of blood) for long periods weakens the brain’s red signal, making it harder to see clearly. Green and blue, being opposite to red on the color spectrum, help refresh the surgeon’s vision and improve focus.

2. **Reduced Risk of Errors:** Enhanced visual acuity from blue and green makes it easier to distinguish subtle shades of red, allowing surgeons to better analyze a patient’s anatomy and reducing the likelihood of mistakes during procedures.