What is myopia? Shortsightedness is characterized by practicality.

The human eye has two abilities: hyperopia and myopia. Today, let's talk about the characteristics of myopia. Usually, people's eyes can not only see far, but also see nearby objects clearly. This ability to see near is called near vision, which is one of the important contents of visual function and refractive function. The full name of myopia is "near-center vision", which is also the ability to measure and distinguish the shape and position of two-dimensional objects. Frontal eyes can clearly see nearby objects through eye adjustment, while hyperopia needs great efforts to see nearby objects. Therefore, myopia is also called "accommodative vision" or "dynamic visual acuity", and hyperopia is correspondingly called "static vision". For a normal person, sometimes near vision is more important than far vision, especially for students and office workers who are mainly engaged in close activities. Good myopia is an important guarantee for completing myopia tasks with high efficiency and high quality. Usually, people can have good far vision and near vision at the same time, but due to the influence of age and refractive state of eyes, it may be better to see near than far, or it may be better to see far than near. Both of these situations are not ideal and will bring some trouble. When you can't have it both ways, most people look close at it. When you grow up, you will have more experience in this field. Do you know the cases in which some people around you had surgery to get good farsightedness and bid farewell to glasses? These people have gained better farsightedness through surgery. The result after the operation may greatly improve your hyperopia, but this is usually achieved by sacrificing some myopia. When we ask for farsightedness, we must never sacrifice myopia.