Abstract: during the development of teenagers’ eyeballs, the development of refractive state is closely related to the visual environment, In particular, the ocular axis (length of anterior and posterior diameter of eyeball) and curvature (curvature of eyeball surface) are the two most sensitive values. The matching of these two eyeball development during children’s growth and development determines whether their eyes are emmetropia, hyperopia, myopia or astigmatism. The development of children’s refractive state is regular, and the development of their normal refractive state changes from hyperopia to emmetropia. If there is a problem with the eye environment at this stage There will also be a development from squareness to myopia, and its general development trend is irreversible., At birth, the length of the anterior posterior diameter of the eyeball, that is, the ocular axis, is short, only 16-17. 1mm, at this time, the baby has + 2. 00D～+4。 Hyperopia around 00D. In the 1 ~ 3 years after birth, the eyeball is in a period of rapid development, and the ocular axis grows rapidly. The ocular axis is generally about 16-19 long. 5mm； From 3 to 18 years old, the eyeball was in a slow development stage, and the length of the ocular axis was about 19. 5-23mm。 Therefore, 3-year-old children should be + 1. 75D-+2。 00D hyperopia; 8-year-old children should have + 1. 25-+1。 50D hyperopia; A 12-year-old should have + 0. 75-+1。 00D hyperopia. Therefore, children under 6 years old have mild hyperopia, although their vision is less than 1. 0 is normal (but it should be above 0.6). Preschoolers have hyperopia. After entering primary school, the hyperopia diopter decreases slowly. At the age of 12, there is a little hyperopia reserve. It is the most ideal refractive state, and the probability of school myopia will be very low. According to the calculation of eyeball geometric optics, every 1mm increase of eyeball axis will produce 3.00d myopia; and there is a very important problem in the development of children’s eyeball The refractive element of the eye – that is the corneal curvature of the anterior surface of the eye. Every 1mm increase in corneal curvature radius will offset 6. 00D myopia. In the three years after birth, the development of the eyeball is the growth of the ocular axis. At the same time, the radius of curvature of the cornea is also growing in a matching way, basically maintaining the hyperopia state. From the age of 3 to 10, the eyeball develops towards emmetropia. At the age of 10, the development of the eyeball is close to that of adults, and the average length of the ocular axis is 23. About 5mm., During the development of teenagers’ eyeballs, the development of refractive state of eyes is closely related to the visual environment, In particular, the ocular axis (length of anterior and posterior diameter of eyeball) and curvature (curvature of eyeball surface) are the two most sensitive values. The matching of these two eyeball development during children’s growth and development determines whether their eyes are emmetropia, hyperopia, myopia or astigmatism. The study found that during the development of eyeball, overuse of eyes at close range and lack of outdoor movement are the main reasons for the development of ocular axis exceeding the normal length, so the two values of ocular axis and curvature are different At the same time, the measurement of corneal curvature is also very important for the classification and diagnosis of astigmatism., Because the occurrence and development of myopia is irreversible, scientific detection according to the law of eye development can find potential patients with recessive myopia as soon as possible, which plays an extremely important role in the prevention and control of myopia. How to delay the age of myopia? How to control the rapid development of myopia? Through the timely biological measurement and prediction of the eyeball, practical intervention measures can be taken to achieve the purpose of prevention. Therefore, we advocate that when children are 3 years old, they should have eye examination, establish eye refractive development files, regularly check and monitor refractive status, and do not have to go to the hospital until the child’s vision decline is irreparable., The development of
children’s refractive state has a certain law, and the development of their normal refractive state changes from hyperopia to emmetropia. If there is a problem with the eye environment at this stage, it will develop from emmetropia to myopia, and its general development trend is irreversible.
and
when people were born, the length of the anterior posterior diameter of the eyeball, that is, the ocular axis, was short, only 16-17. 1mm, at this time, the baby has + 2. 00D～+4。 Hyperopia around 00D. In the 1 ~ 3 years after birth, the eyeball is in a period of rapid development, and the ocular axis grows rapidly. The ocular axis is generally about 16-19 long. 5mm； From 3 to 18 years old, the eyeball was in a slow development stage, and the length of the ocular axis was about 19. 5-23mm。 Therefore, 3-year-old children should be + 1. 75D-+2。 00D hyperopia; 8-year-old children should have + 1. 25-+1。 50D hyperopia; A 12-year-old should have + 0. 75-+1。 00D hyperopia. Therefore, children under 6 years old have mild hyperopia, although their vision is less than 1. 0 is a normal phenomenon (but it should be above 0.6). Preschoolers have hyperopia. After entering primary school, hyperopia diopter decreases slowly. At the age of 12, there is a little hyperopia reserve. It is the most ideal refractive state, and the probability of school myopia will be very low.
According to the calculation of eyeball geometric optics, every 1mm increase of eyeball axis will produce 3. 00D myopia; Another important refractive factor in the development of children’s eyeballs is the corneal curvature of the anterior surface of the eyeball. Every 1mm increase in corneal curvature radius will offset 6. 00D myopia. In the three years after birth, the development of the eyeball is the growth of the ocular axis. At the same time, the radius of curvature of the cornea is also growing in a matching way, basically maintaining the hyperopia state. From the age of 3 to 10, the eyeball develops towards emmetropia. At the age of 10, the development of the eyeball is close to that of adults, and the average length of the ocular axis is 23. About 5mm.
and
during the development of teenagers’ eyeballs, the development of refractive state of eyes is closely related to the visual environment, In particular, the ocular axis (length of anterior and posterior diameter of eyeball) and curvature (curvature of eyeball surface) are the two most sensitive values. The matching of these two eyeball development during children’s growth and development determines whether their eyes are emmetropia, hyperopia, myopia or astigmatism. The study found that during the development of eyeball, overuse of eyes at close range and lack of outdoor movement are the main reasons for the development of ocular axis exceeding the normal length, so the two values of ocular axis and curvature are different It is more important and objective in the prediction and diagnosis of myopia. At the same time, the measurement of corneal curvature is also very important for the classification and diagnosis of astigmatism.
because the occurrence and development of myopia is irreversible, scientific detection according to the law of eye development can find potential patients with hidden myopia as soon as possible, which plays an extremely important role in the prevention and control of myopia. How to delay the age of myopia? How to control the rapid development of myopia? Through the timely biological measurement and prediction of the eyeball, practical intervention measures can be taken to achieve the goal of prevention and treatmentSuffer from an unexpected purpose. Therefore, we advocate that when children are 3 years old, they should have an eye examination, establish an eye refractive development file, and regularly check and monitor their refractive status. Don’t have to go to the hospital until the child’s vision decline is irreparable.