Why, in old age, in a person who is short-sighted from childhood, vision can become normal?

With age, the elasticity of the lens is lost, which leads to the development of farsightedness in the normal eye, and if the eye was short-sighted, then the superposition of these two visual defects can lead to the formation of an image on the retina.

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.