0-6 months: Newborn babies are not mature because of their visual structure and optic nerve that receives visual information through their eyes. Specifically, the pyramidal cells in their retinas are immature. They only see light and shadow, and their best focal length is between 20 and 38 cm, which means that the baby can just see mommy's face when nursing.
6- 12 months: it is the color period of baby's vision and the key period of baby's vision development. Some experts believe that sensitivity to color begins four months after birth.
1-3 years old: the baby entered the golden age of building a sense of plane and began to know more about the plane space such as distance, front and back, left and right. Their vision began to transition from understanding two-dimensional space to three-dimensional space.
3-6 years old: it is the spatial period of baby's visual development. They can accurately distinguish the size, up and down, front and back, left and right, and distance of objects. At this point, the baby's vision reaches the level of adults.
Law of eyeball development:
The development of eyeball is synchronous with the development of body. At birth, the eyes are very small, slightly flat oval sphere, and its front and rear diameter is only about17 mm. With the rapid development of the body from birth to 3 years old, the eyeball quickly grows to a nearly round sphere with a diameter of 22mm; From then on 13 years old, the eyes did not grow synchronously with the body. In the period of 10, they are only 1mm long, that is to say, at the age of 13, the diameter of the eyeball is about 23mm, and the eyeball is mature and basically stops growing. Every increase in axial length of 1mm is equivalent to an increase of -3.0D in myopia.
Measures to protect eyesight:
1, vision screening in the park. The instrument can be a vision screening instrument har-880, which can screen out ametropia and amblyopia.
2, electronic visual acuity chart, visual recognition test, can find out color weakness, color blindness.
3. Appropriate parental education should pay attention to let children eat more vegetables, prevent children from reading too early and practicing musical instruments.