Within 1 month: At one week of birth, the baby’s vision tends to be nearsighted and can focus on objects 8 to 15 cm away, and is also able to follow moving objects with his eyes. After one week, he can see objects at 3 m. He will also learn to follow moving objects and enjoy looking at human faces or high-contrast patterns. at a little over 1 month, the infant can see objects within 15-30 cm of his eyes and can gaze at objects. 2 Months: By 2 months of age, infants’ visual focus becomes more pronounced and they enjoy looking at moving objects and familiar adult faces. They are able to look at objects in a coordinated manner, distinguish colors but not shades, move their eyes with objects within 90 degrees, blink and other protective reflexes when an object quickly approaches their eyes, and gaze at small hands for more than 5 seconds. 3-4 months: At 3 months of age, infants can fixate on objects, see objects about 75 cm away, and have a visual acuity of about 0.1. The duration of gaze is significantly longer, and the eyesight can also follow moving objects. Sensitive to color, infants have a preference for color, preferring to see bright and vivid colors, especially red, and disliking dull colors. Their preferred colors are red, yellow, green, orange, blue, etc., in that order. When lying on their backs, both eyes will track people walking around. Often walk consciously in front of the baby to attract the baby’s attention and observe whether the baby’s eyes will follow. 5-6 months: Blinks more often, can see objects accurately in front of him/her, and will grab them and play with them in front of his/her eyes. When the child sits up to play, his hands can manipulate objects under the control of his eyes, he will stare at what he gets, and hand-eye coordination begins. Present the toy in front of the baby’s eyes and move it slowly up and down, observing whether the baby can consciously follow it actively. at more than 6 months of age, the eyes can turn 90 degrees up and down following the moving object. At this time, the child’s visual acuity can reach 0.1, and can look at objects at a distance, such as pedestrians and vehicles on the street. 7-8 months: can identify objects near and far and space; like to find those suddenly missing toys; play hide and seek with the baby “game, observe the baby’s level of excitement and response in time or not. 9-10 months: The eyesight can move up and down with moving objects, can follow falling objects, look for dropped toys, and can distinguish the size, shape and speed of movement of objects. Can see small objects, can begin to distinguish simple geometric shapes, and observe different shapes of objects. The sense of depth of vision begins to appear, which is actually a form of stereoscopic perception. 11-12 months: Vision can move up and down with moving objects and can follow falling objects; vision can reach 0.2 at the age of 1 year. 1-2 years: After the age of 1 year, they like to read books, can distinguish objects and can imitate actions. Under the continuous stimulation of external environmental light, the child’s vision is gradually developing, and by 1.5 years old, his vision can reach 0.4, and he can see tiny things such as crawling bugs and mosquitoes, and can gaze at small toys 3 meters away. He can also distinguish simple shapes, such as circles, triangles, and squares. 2-5 years old: visual development is most vigorous in both eyes. 2-3 years old, visual acuity reaches about 0.5-0.6, which is close to adult visual acuity, but it is very easy to lose vision at this time. At the age of 4 or 5, the visual acuity is about 1.0, and various eye physiological reflexes have been formed and tend to be stable, so it is not easy to lose vision at this time. Children at this stage can judge the size of objects, up and down, inside and outside, front and back, near and far, and other spatial concepts. 6 years old: At the age of six or seven years old, they enter adult vision. The stereopsis function will not reach normal until the age of 9.