List any visual impairment known to you.

The ability to see well only distant objects is a sign of hyperopia. A person who sees only up close is short-sighted. These disorders can be congenital, age-related, or associated with poor visual hygiene. If the curvature of the cornea is not the same in its various parts, the person develops astigmatism.

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.