Hello everyone, today I will answer the following questions for you. Regarding astigmatism, many people still don’t know the principle of astigmatism. Let’s take a look together now!
Contents of this article
- Symptoms of astigmatism in children
- What do dispersion and astigmatism mean
- The principle of astigmatism
- What degree of astigmatism is 3.0
- How many degrees of astigmatism is considered serious in the eyes
1. Symptoms of astigmatism in children\’s eyes
The symptoms of astigmatism in children\’s eyes The main symptom is that you cannot see things clearly in the distance, especially when watching TV, you will move forward unconsciously or squint your eyes to see things. This may be astigmatism. If you want to be completely sure that it is astigmatism, you still need to Go to the ophthalmology department of the hospital for an optometry examination. After the optometry, if you have astigmatism, you will need to wear glasses with the corresponding degree.
2. What do dispersion and astigmatism mean
1. Astigmatism is mainly It refers to a refractive state in which the refractive power of the eyeball is different at different meridians. The image formed by parallel light refracted through the eyeball is not a focus, but two focal lines and the minimum circle of diffusion at different positions in space.
2. Dispersion is the phenomenon in which complex colored light is decomposed into monochromatic light to form a spectrum
3. Principle of astigmatism
Astigmatism is mainly due to the fact that external objects have different refractive powers when passing through the meridian in front of the eye, and cannot focus on the retina at the same time. That is, the corneal refractive power of the horizontal meridian and the vertical meridian are different. One side has a high curvature and the other side has a low curvature. As a result, the light on both sides cannot be focused at the same time, causing astigmatism. Astigmatism is divided into simple astigmatism, including simple myopic astigmatism, simple hyperopic astigmatism, compound astigmatism, and mixed astigmatism.
4. What is the degree of astigmatism 3.0?
Generally, the degree of astigmatism is between 0-1000 degrees. According to the degree of astigmatism, it is divided into three categories: low astigmatism, moderate astigmatism and high astigmatism.
1. Low-grade astigmatism: Astigmatism with a degree below 100 degrees is called low-grade astigmatism. If it does not affect normal vision and the eyes do not feel tired, correction is not required. .
2. Moderate astigmatism: Astigmatism before 100-200 degrees is called moderate astigmatism, which is usually corrected through optical glasses.
3. High astigmatism: Astigmatism above 300 degrees is considered high astigmatism and can be treated by wearing glasses and performing eye laser surgery.
5. How much astigmatism is considered serious
Generally speaking Astigmatism exceeding 100 degrees is considered severe astigmatism, which will affect the patient\’s vision and make the patient\’s life and work inconvenient. Astigmatism is mostly due to genetic factors or acquired bad eye habits. The resulting refractive errors need to be corrected in a timely manner by going to a regular medical institution for optometry and glasses. In the daily diet, eating more foods rich in vitamin A and avoiding excessive use of the eyes for a long time can effectively control the increase in the degree of astigmatism.
The sharing of problems about astigmatism and the principles of astigmatism is over. Did the above article solve your problem? Welcome to come again next time!
