Children are short-sighted. Some parents must not know

Abstract: the retina is located in the inner wall of the eye, with photosensitive and conductive functions. It is the “film” of the eye, an advanced camera. When the image does not fall on the “film”, it is called defocus. At this time, the eyes feel as if it is blurred. What symptom does

child myopia have?

when the child has the following symptoms, parents should pay attention to it and quickly take the child to the hospital to check whether he is short-sighted.

  1. Squint at TV and read

2 If your eyes are uncomfortable, often rub your eyes

3 Can’t see the blackboard clearly or often copy the wrong

and

4 What is the principle of children’s myopia?

myopia is that when the eye is in a relaxed state of adjustment, the focus of parallel light falls in front of the retina after refraction through the refractive system of the eye.

why do children have myopia? At present, there is no definite conclusion about the causes of myopia in

and

, which can be roughly summarized into the following three aspects:

and

heredity “and

and

myopia can be inherited. Children with both parents’ myopia and children with one parent’s myopia have a much higher risk of myopia than ordinary children.

environment

reading and playing with mobile phones for a long time, the light is too dark or too bright, reading in a bumpy environment, incorrect writing posture and other nonstandard close eye use are all important reasons for myopia.

malnutrition, too little outdoor sports and some diseases can also cause myopia.

why does the myopia of children increase? The lengthening of

and

axis is the main reason for the increase of myopia. Myopia increases by 300 degrees for every 1mm extension of the ocular axis.

1. Physiological growth

adolescents are in the stage of growth and development, and the ocular axis will grow with growth and development.

II. Retinal defocus

the retina is located on the inner wall of the eye. It has photosensitive and conductive functions. It is the “film” of this advanced camera. When the image does not fall on the “film”, it is called defocus. At this time, the eyes feel as if it is blurred.

1. Hyperopia defocus

2. Peripheral retinal defocus

wear frame glasses, and the image falls on the central retina. However, due to the characteristics of optical glasses, the peripheral image still falls behind the retina, which is called peripheral retinal defocus. The peripheral retina of

and

also plays an important role in the extension of ocular axis, so peripheral hyperopia retinal defocus is also the main reason for the growth of myopia.