A four-year-old child with 500 degrees of hyperopia needs glasses to improve his vision so as not to affect the development of his vision and develop amblyopia. Usually, the physiological degree of hyperopia in 3~4 year old children is about 175~200 degrees. That is to say, 3~4 years old children do not need to wear glasses if their farsightedness is within the range of physiological degrees. Usually, farsightedness can be improved naturally with the growth of age and the gradual development of the eyeballs. However, a four-year-old child with hyperopia of 500 degrees, far beyond the normal physiological degrees, usually needs to wear glasses to correct hyperopia, which can help improve vision and reduce the symptoms of visual fatigue. If the child does not wear glasses for a long time, amblyopia may occur, or even cause strabismus. It is recommended that children with hyperopia should consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions to choose the appropriate treatment to avoid affecting the development of the child’s vision.