Frequent rubbing may cause astigmatism

The normal corneal surface should be round like a basketball, and its horizontal, vertical, or oblique yield radii are the same, and the light will focus on the same point as it passes. However, the surface of the astigmatic cornea is not round or rugby-shaped. Because the horizontal and vertical refractive index radii are different, it cannot be gathered at the same point. The image seen may have horizontal or vertical lines that are clear, but relatively 90 degrees. The direction lines are blurred.

What are the bad symptoms of astigmatism?

The cause of astigmatism is that the curvature of the cornea is not correct. Mostly congenital formation, but individual eyelids long sputum granuloma will also cause astigmatism when the eyeball is pressed for a long time. The astigmatism is myopic hyperopia or one of the radial lines is hyperopia, and the other is the so-called mixed astigmatism of myopia.

High astigmatism is not easy to cause headache, eye acid and other phenomena, but also easy to cause bad posture such as steamed bread; so the degree of astigmatism must be corrected.

Astigmatism is usually corrected with ordinary glasses or contact lenses. Astigmatism is generally formed innate, but there are also individual causes of the day after tomorrow can cause confusion, the simplest example is; trauma and eyelid long sputum granuloma is not treated in time, will cause eyeballs for a long time and cause astigmatism. In some cases, astigmatism will also be combined with pseudomyopia. At this time, the pseudo-myopia part should be removed, and the astigmatism should be corrected by the glasses.

Don't blink your eyes often

Hand rubbing when the eyes are uncomfortable is a habit of many people. Ophthalmologists point out that rubbing your eyes often can cause astigmatism, which can cause blurred vision.

Ophthalmologists have found in clinical investigations that people mostly know that people with myopia are accompanied by astigmatism, which is caused by changes in corneal curvature. But people don't know that rubbing their eyes is also an important cause of astigmatism.

In the survey, some people find that when they have uncomfortable eyes and allergies, they will scream when they are itchy. "When you blink your eyes, you usually close your eyes. At this time, the eyeballs will move upwards, and the pressure will gather under the eyes. Causes the curvature of the cornea to change. If the curvature of the cornea is uneven, astigmatism will appear." Experts explained.

Astigmatism is also related to the crystals in the eye. If its curvature is not uniform, or the crystal ages to change the refractive index of light entering the eye, it will also cause astigmatism. Therefore, rubbing your eyes often increases the risk of astigmatism, especially among adolescents.

The researchers also pointed out that although severe astigmatism is unclear, astigmatism with a low degree of astigmatism also has a certain effect. The astigmatism below 75 degrees helps to see the distance, beyond this degree, it will be blurred in the distance. Therefore, if the astigmatism is below 75 degrees, it is generally unnecessary to add the astigmatism correction function to the lens when the lens is attached.