The farsightedness of four years old is about 200-175 degrees, in fact, after birth, itself is in a state of farsightedness, with the growth and development, the development of the eyeballs will be gradually perfected, and will gradually develop into a state of orthopia, which is called orthopticization of development. After reaching orthokeratization, if affected by some adverse factors, it will gradually grow and can only develop into myopia. Each age group will have a normal physiological reserve, that is to say, the normal degree of hyperopia exceeds this degree, may need to be corrected, to prevent the impact on vision, the degree of hyperopia in different age groups are as follows: 1, 3-4 years old: generally 3-4 years old visual acuity of 0.6, the degree of hyperopia is about 200-175 degrees, 2, 5-6 years old: 5-6 years old visual acuity of 0.6-0.8, the degree of hyperopia is about 175 degrees, and the degree of hyperopia is about 175 degrees, and the degree of hyperopia is about 175 degrees. The level of hyperopia is about plus 175-150 degrees, 3, 7-8 years old: 7-8 years old visual acuity is generally in the 0.8-1.0, the level of hyperopia is in the plus 150-125 degrees, 4, 8-12 years old: 8-12 years old visual acuity can reach 1.0 or above, the level of hyperopia is in the plus 125-0 degrees, that is, basically, by the age of 12 years old there is no hyperopia level exists, and has reached the level of orthoptic vision. The level of visual acuity is positively visualized.