The eyes mature from birth to about three years of age, and the eye axis is about 16 millimeters to about 19.5 millimeters, but the chronic developmental maturity is from about three to 18 years of age, and the eye axis is about 19.5 millimeters to about 23 millimeters. Usually after three months of life, you will gradually see something, but the eye development is not fully mature, see things rather blurred, it is not until about three years of age that you begin to gradually vision increase, more and more can see clearly. During eye development, try not to be stimulated by bright light. Eye development gradually matures. before the age of 3 is the critical period of visual development, and 12 years old is the sensitive period of visual development. Generally speaking, eye development will be almost complete by the age of 18. For eye safety, regular eye checkups are needed to ensure eye safety. At the same time, you need to pay attention to the rest of your eyes in your daily life and use your eyes reasonably to avoid myopia.