You are a miracle - sharp eyes

The human eye has a highly sensitive visual ability. There are millions of photoreceptor cells on the retina, divided into rod cells and cone cells. Rod cells can capture light in low light conditions, allowing us to see objects even in the dark; Cone cells are responsible for perceiving colors and providing high-resolution vision, enabling us to recognize subtle color differences and details.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

How does the human eye recognize colors? Cone cells are a type of visual cell named after the cone-shaped dendrites (as shown in the figure below). There are approximately 6-7 million cone cells on each eyeball, which are primarily responsible for color recognition and are more effective in relatively bright lighting. There are usually three types of cone cells in the human eye that distinguish colors, corresponding to three different spectral regions: short wavelength (blue light), medium wavelength (green light), and long wavelength (red light). When light enters the eye and falls on the retina, different wavelengths of light stimulate different types of cone cells. Each cone cell has the strongest response to specific wavelengths of light, but also has a certain response to adjacent wavelengths of light. By activating different combinations of these three types of cone cells, the human eye can perceive a wide range of colors.