What is astigmatism, what are the causes of astigmatism, and what is the harm to vision?

What is astigmatism, what are the causes of astigmatism, and what is the harm to eyesight?

Astigmatism is a common disease, the incidence rate of which is one in every four healthy people, and the incidence rate is higher in myopic people, which is three in every five. Astigmatism is very harmful, which can easily lead to visual fatigue, amblyopia and vision loss. So what exactly is astigmatism? What are the causes of astigmatism? What is the harm to vision? 1. What is astigmatism?

To put it bluntly, astigmatism refers to the fact that the eye is not spherical, which leads to its different refractive power on the meridian, and then makes the refractive situation of the two focal lines and the least diffuse spots in the meridian skewed. Generally speaking, astigmatism is mostly caused by genetic inheritance, and some of it is also caused by poor natural environment for reading articles. This causes the corneal inclination to be irregular, which makes the horizontal inclination and vertical inclination, that is, the focus of meridian, different, and there are errors. Finally, the objects seen in the two directions cannot be completely overlapped, and there are overlapping shadows. Astigmatism can be divided into congenital astigmatism and acquired astigmatism, as well as standard astigmatism and irregular astigmatism.

2. The relationship between astigmatism and myopia

Astigmatism is the error of light gathering in everyone's eyes, which is mainly manifested in blurred vision of distant objects and unclear vision of near objects. According to the above situation and the definition of astigmatism, we all realize that astigmatism is not immediately related to eye myopia. Generally speaking, people with myopia can have astigmatism, and people with hyperopia can also have astigmatism. However, it cannot be denied that the prevalence rate of astigmatism in myopia group is higher than that in healthy group.

3. Influence of astigmatism on vision

Astigmatism is a condition of binocular astigmatism, and its damage is relatively large, mainly including:

First, visual fatigue. Because the object light can not produce the established focus point after entering the eyes, it leads to the command from the human brain to watch further, which leads to visual fatigue. Moreover, in order to see things better, astigmatism eyes will adjust the diffuse circle as much as possible, further aggravating visual fatigue.

the next is vision loss. When astigmatism sees things, the color tone avoiding the focal line of the fundus macula becomes shallow and virtual, and some of them will also have diplopia, which leads to people having to move closer to watch. Over time, it is very easy to reduce the visual effect.

Pseudomyopia again, because the near point and the far point are blurred, it is easy to cause pseudomyopia. Some references confirm that astigmatism is closely related to pseudomyopia, and sometimes esotropia will continue to occur.

it is the bad habit of squinting in the end. Some people with astigmatism will habitually squint their eyes in order to see things better, which will lead to the bad habit of squinting, which will affect the image temperament to a certain extent and easily lead to misunderstanding.

4. Ways to treat astigmatism

For these people with slight astigmatism, their own astigmatism does not affect their visual function or vision, so they can not solve it. If the vision is significantly affected, it is necessary to take the initiative to correct it, and you can wear astigmatism myopia glasses. Astigmatism is more serious. After wearing the general eye correction, you will have uncomfortable symptoms such as nausea, vomiting and dizziness. You can wear contact lenses or carry out surgery.

Eyes are the windows of the soul, and everyone expects their eyes to be bright. Due to congenital genetic inheritance and acquired natural environment, many people are prone to astigmatism, which leads to pseudomyopia, eye fatigue and reduced vision to a certain extent, which has a great impact on everyone. You can effectively choose rimmed glasses for treatment and surgical treatment according to your own situation. In daily life, we also need to pay attention to the habit of writing and keep the distance between our eyes and books 3CM. Keep a steady reading habit and don't study in the dark. Expect everyone to be bright-eyed, healthy and happy.