How does the human eye work?

The human eye consists of a spherical cornea and a lens, which has the shape of a double-convex lens. Under the action of a special muscle, the radius of the spherical surfaces of the lens can change, which leads to a change in the focal length of the eye.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.