Abstract: some teenagers make full use of their time to read while walking or in the carriage, which is very bad for their eyes. Because the carriage is shaking and the body is shaking, the distance between the eyes and the book cannot be fixed, and the poor lighting conditions aggravate the burden on the eyes. Often this may cause myopia., A survey found that the number of teenagers suffering from myopia is increasing year by year, which is a dangerous signal. So, why are more and more teenagers suffering from myopia? According to expert analysis, this has a lot to do with teenagers’ daily eye habits. Next, experts specifically analyzed the causes of juvenile myopia., 1. The distance between eyes is too close. Juvenile myopia is often caused by too close distance between eyes for a long time. Teenagers have strong eye adjustment. They can still see objects when the distance between books and eyes is up to 7-10 cm. However, if they often read at this distance, writing will make the adjustment of eyes extremely tense, which can form refractive (regulatory) myopia, the so-called pseudomyopia. If the long-term adjustment is excessive, the ciliary muscle can not stretch flexibly. Due to the excessive adjustment, the convergence effect is strengthened, so that the extraocular muscles exert pressure on the eyeball, the intraocular pressure increases, and the intraocular tissue is congested. In addition, the juvenile eyeball tissue is delicate, the eyeball wall is compressed and gradually extends, and the front and rear axes of the eyeball become longer than the normal value, forming axial myopia, the so-called true myopia. The normal reading distance should be 30-35 cm., 2. The eye use time is too long. Some teenagers don’t rest for 3-4 hours in a row, such as reading, writing, homework and watching TV, or even go to bed late at night. This not only affects their health, but also overburdens their eyes. Their internal and external muscles are tense for a long time and can’t rest. Over time, when they look at the distance, The muscles of the eyes cannot be relaxed and are in a spasmodic state. In this way, they feel blurred at a distance and form myopia. This is why some students’ eyesight drops significantly after a summer vacation. It is generally advocated that you should take a break or look into the distance for a while after reading, writing or watching TV for 40-50 minutes., 3. The lighting light is too strong or too weak. If the light is too strong, such as sunlight, it will cause strong reflection, stimulate the eyes, make the eyes uncomfortable, and it is difficult to see the font. On the contrary, the light is too weak, the written lighting is insufficient, and the eyes can’t clearly see the font, the head will move forward and get close to the book. In both cases, the eyes are prone to fatigue, Myopia is caused by excessive adjustment or spasm of the eyes., 4. Reading in the car or walking,
a survey found that the number of teenagers suffering from myopia is increasing year by year, which is a danger signal. So, why are more and more teenagers suffering from myopia? According to expert analysis, this has a lot to do with teenagers’ daily eye habits. Next, experts specifically analyzed the causes of juvenile myopia.
1. Too close eye distance
juvenile myopia is often caused by too close eye distance for a long time. Teenagers have strong eye adjustment. They can still see objects when the distance between books and eyes is up to 7-10 cm. However, if they often read at this distance, writing will make the adjustment of eyes extremely tense, which can form refractive (regulatory) myopia, the so-called pseudomyopia. If the long-term adjustment is excessive, the ciliary muscle can not stretch flexibly. Due to the excessive adjustment, the convergence effect is strengthened, so that the extraocular muscles exert pressure on the eyeball, the intraocular pressure increases, and the intraocular tissue is congested. In addition, the juvenile eyeball tissue is delicate, the eyeball wall is compressed and gradually extends, and the front and rear axes of the eyeball become longer than the normal value, forming axial myopia, the so-called true myopia. The normal reading distance should be 30-35 cm.
2. Using eyes for a long time
some teenagers don’t rest for 3-4 hours, such as reading, writing, doing homework and watching TV, or even go to bed late at night. This not only affects their health, but also overburdens their eyes. The muscles inside and outside their eyes are tense for a long time and can’t rest. Over time, when they look at the distance, The muscles of the eyes cannot be relaxed and are in a spasmodic state. In this way, they feel blurred at a distance and form myopia. This is why some students’ eyesight drops significantly after a summer vacation. It is generally advocated that you should take a break or look into the distance for 40-50 minutes of continuous reading, writing or watching TV.
3. The lighting light is too strong or too weak
if the light is too strong, such as sunlight, it will cause strong reflection, stimulate the eyes, make the eyes uncomfortable, and it is difficult to see the font. On the contrary, the light is too weak, the written lighting is insufficient, the eyes can’t see the font clearly, and the head will move forward and close to the book, The above two conditions can cause eye fatigue, excessive eye adjustment or spasm and form myopia.
4. Read while in the car or walking
some teenagers make full use of their time to read while walking or in the walking carriage, which is very harmful to their eyes. Because the carriage is shaking and the body is shaking, the distance between eyes and books cannot be fixed, and the poor lighting conditions aggravate the burden on eyes. Often this may cause myopia.