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How does astigmatism occur? Congenitally formed? Acquired factors? Astigmatism Science

Posting time:2023-01-28 03:16:43

How does astigmatism occur? Congenitally formed? Acquired factors? Astigmatism Science

Some children have trouble seeing things clearly and blurry when they are very young. Parents brought it for examination, and they already have different degrees of astigmatism at a young age! Although parents have strictly controlled their children’s long-term fatigue and eye use, and stipulated the time for watching TV and mobile phones, astigmatism still occurs. What is going on?

How much do you know about astigmatism

Astigmatism is an external object that cannot be gathered into a focal point on the retina, presenting a blurry and blurred image, mostly due to our cornea caused by a change in arc. Suppose the human eyeball is imagined as a spherical surface, and there is a degree in each direction in 360 degrees; if the diopter in all directions is the same, the eyeball refractive system is like a smooth "basketball", then it means that the eye has no astigmatism. But our eyeball is not a "sphere", but an "oval", similar to a football ball. So many people will have more or less congenital astigmatism. The reason for the formation of astigmatism is that the eyeball has different refractive powers in different directions, so that the parallel light rays cannot be focused on the same point on the retina after being refracted by the eyeball. Eyes can't focus, and things are blurred and ghosted.

Congenital Factors

Astigmatism is generally caused by congenital development. In the process of embryonic development, some children will have astigmatism problems, but it is still not clear what factors are caused by medical science. Generally speaking, the congenital astigmatism in children is mainly corneal astigmatism. As for the problem of abnormal embryonic development, since no clear mechanism has been found, there is currently no way to prevent it. However, I can be a little reassured that the degree of astigmatism formed by nature is usually relatively stable, and the degree of astigmatism will not deepen with the increase of age; clinically, almost everyone has astigmatism more or less, and astigmatism within 100 degrees is very Common, astigmatism within 50 degrees belongs to the normal range.

Acquired Factors

Trichiasis: "eyelashes grow upside down", which is not uncommon in children. Since it can irritate the cornea and cause many dry spots on the cornea, it can lead to a slight increase in astigmatism. Eye rubbing: Improper sleeping position, prolonged eyelid closure: As long as these actions affect the changes in corneal morphology, it may lead to an increase in astigmatism. Trauma and acquired corneal lesions: due to trauma to the cornea, left corneal scars lead to astigmatism; for example, keratitis may also lead to corneal scars, further causing irregular astigmatism.

How can people with astigmatism protect their eyes?

1. Do not turn off the lights to play with your phone at night, but dim the screen brightness; try to avoid lying on your side to play with your phone or read a book, you can lie flat. 2. If you can't see clearly, either don't look, or wear glasses to see, don't squinting; try not to rub your eyes with your hands frequently, and use eyewash when your eyes are itchy. 3. When the eyes are dry, blink more to moisten the lower cornea. If it is serious, use a hot towel to compress the eyes or apply artificial tears; the reading posture should be correct, do not read in a shaking car, and the font should be clear when choosing reading materials. too small. 4. Avoid operating the computer continuously for a long time, pay attention to rest in the middle, usually operate continuously for 1 hour, rest for 5-10 minutes; maintain a good working posture. Maintain a proper posture, so that the eyes are looking straight or slightly down on the screen, which will relax the neck muscles and reduce the area of ​​the eyeballs exposed to the air.

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