Hello everyone, today I will answer the following questions for you. Regarding astigmatism, many people don’t know where the astigmatism is. Now let’s take a look. Bar!
Contents of this article
- The principle of astigmatism
- What is the axial direction of astigmatism
- Where is the astigmatism
- What kind of treatment is needed for astigmatism
- Does astigmatism require glasses
1. The principle of astigmatism
Astigmatism is mainly caused by the outside world Objects, with different refractive powers when passing through the meridian in front of the eye, cannot be focused 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.
2. What does the axial direction of astigmatism mean
Astigmatism The axis is the position of the astigmatism meridian. If there is astigmatism, it is axial, and the axial direction is 0 to 180 degrees. When looking at glasses, only when the axis is aligned and the lenses are tried on can the lenses be clear. If the lenses are misaligned and have astigmatism, they will not be clear. Under normal circumstances, astigmatism within the physiological range of astigmatism is within 75 degrees. If it exceeds 75 degrees, it will affect vision. When wearing glasses, you need to add the degree.
3. Where is the astigmatism?
The axis is at In the optometry results, the location of astigmatism is indicated. Astigmatism is a local refractive error caused by irregularities in the surface of the cornea. In order to clearly express the astigmatism and the specific position of the cornea, the upper part of the cornea is artificially divided into 180 degrees from the inside to the outside, taking advantage of the fact that the human cornea is approximately circular and symmetrical up and down. The inner horizontal position is 0 degrees and the outer horizontal position is 0 degrees. 180 degrees to determine the location of the maximum degree of astigmatism.
4. What subjects are involved in astigmatism
Go to the hospital for ophthalmology. If astigmatism occurs, you must go to the hospital regularly for relevant examinations to avoid spreading eye diseases. You can wear cylinder lenses under the guidance of a doctor. for optical correction. This is the most important treatment method to solve astigmatism. If it is severe, surgical treatment is required. The doctor will choose a treatment plan based on the specific situation of astigmatism.
5. Do I need glasses for astigmatism?
Do I need glasses for astigmatism? The need to wear glasses depends on the specific situation. If the degree of astigmatism exceeds 75 degrees, it exceeds the normal physiological range and affects the naked eye vision, so you need to wear glasses. Especially long-term astigmatism in childhood can cause amblyopia. If If the degree is less than 75 degrees, it will not have a great impact on vision, so you can consider not wearing glasses.
Okay, the article ends here. If the astigmatism and where the astigmatism is shared this time is helpful to you, please pay attention. Go to this site!
