Cells are particularly sensitive to yellow light, and the three cone cells are red, green and blue.
The most sensitive. Because of this visual structure, people can easily distinguish between red and green. Although yellow
Color and blue are also easy to distinguish, but because of the eyeball, there are fewer photosensitive cells sensitive to blue light.
Therefore, it is better to distinguish between red and green.
The red light wave is the longest, and the longer the light wave, the greater the ability to penetrate the surrounding medium. therefore
Red is the farthest display, and people's eyes are more sensitive to red because
Here, red is often used as the color of warning signs. In some occasions or articles,
When you see a red sign, you often can understand the meaning of warning danger without looking at the content carefully.