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
- Does astigmatism require glasses
- The principle of astigmatism
- What does the axial direction of astigmatism mean
- What department is involved in astigmatism
- Where is astigmatism
1. Do people with astigmatism need glasses?
Astigmatism requires glasses There is no need to wear glasses. It 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 the degree is less than 75 degrees, the impact on vision will not be too great, and you may consider not wearing glasses.
2. The principle of astigmatism
Astigmatism is mainly caused by external objects , the refractive power when passing through the meridian in front of the eye is different and 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.
3. 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.
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 cylindrical lenses under the guidance of a doctor for optical correction. This It is the most important treatment method to solve astigmatism. If it is severe, surgical treatment is required. According to the specific situation of astigmatism, the doctor will choose a treatment plan.
5. Where is the astigmatism
The axial position indicates the location of astigmatism in the optometry results. Astigmatism is caused by irregularities in the corneal surface. In order to clearly express the specific location of the astigmatism in the cornea, the upper part of the cornea is artificially divided into 180 degrees from the inside to the outside by taking advantage of the fact that the human cornea is approximately round and symmetrical, and the inner horizontal position is 0 Degree, the outer horizontal position is 180 degrees to determine the location of the maximum degree of astigmatism.
END, this article ends. If it can help everyone, please pay attention. This site!
