When people stare at a color for a long time, the optic nerve is prone to fatigue. In order to relieve fatigue, people's optic nerve will consciously adjust, and then the color of the complementary color will be automatically generated by people staring at it as a kind of adjustment. This perception is called visual afterimage. For example, when people stare at red for a long time, people's optic nerves experience fatigue, and at this time, when people's eyes around the line of sight are moved to a white wall, the visual afterimage will make people feel that they can see The walls are light green.
The same goes for doctors who wear blue when performing surgery. When a doctor performs an operation on a patient, because the doctor inevitably stares at the red blood, it is easy for the doctor to have visual fatigue and cause him to be unable to concentrate. When a doctor puts on a blue surgical gown, the ubiquitous blue is the complementary color of red blood, which can reduce the doctor's visual fatigue and attract the doctor's attention, thereby greatly improving the success rate of the operation. Green color surgical gown is of the same effect.
