The newborn’s eyeball is about 2/3 of the adult’s eyeball, and its vision at birth can only discriminate between light and dark; the infant can have a brief fixation at 1 week, that is, to see something can be slightly focused, but not for a long time, the next few months will be rapid development, to 3 months of age, the vision is about 0.01, can already clearly stare at the shaking things in front of the eyes; at 3-4 months of age will Learning to look at objects with both eyes at the same time, his stereo vision is also developed, but stereo vision is usually fully developed at the age of 3-5 years. At 6 months of age, it is possible to stare at objects clearly with the “central recess”; at 1 year of age, the visual acuity has reached about 0.2, which is equivalent to about 200 degrees of adult myopia. After that, the visual acuity will increase year by year, the eye is also gradually elongated, 3-year-old children have 0.5 to 0.6 vision, the normal development of children during this period should have low farsightedness, the size of the two eyeballs is about 2.2cm, very close to the adult eye 2.4cm. 6-year-old children can reach 1.0 normal visual acuity, the visual system is basically fully developed. Although children can present a hyperopic state until the age of 6, they will not exceed 200 degrees of hyperopia without relaxation of accommodation.