What does astigmatism mean

summary

Astigmatism is a word we often hear in our life. There are many friends whose eyes are astigmatism, but many people don't know much about astigmatism. Let's share what astigmatism is.

What does astigmatism mean

First, astigmatism is an abnormal refraction of the eye, which is related to the curvature of the cornea. Some people's corneas are curved at one angle, while others are flat.

Second, the cause of astigmatism is that the refractive rate of each meridian of the cornea is not consistent due to the uneven thickness of the cornea or the uneven curvature of the cornea, so that the light passing through these meridians can not focus on the same focus, and the light can not accurately focus on the retina to form a clear image, which is called astigmatism.

Third, regular astigmatism is mostly caused by congenital corneal abnormalities, and there may be lens astigmatism. There are also some acquired astigmatism, such as eyelid long needle eye or miliary swelling, long-term eye posture is bad (such as often squinting, rubbing eyes, lying reading, etc.), so the eyelid pressure on the cornea will also change the corneal curvature, astigmatism and increase the degree of astigmatism.

matters needing attention

People with astigmatism in their eyes must pay attention not to use their eyes excessively in their daily life. They should pay attention to the hygiene of their eyes. At ordinary times, they should insist on doing eye exercises, which can alleviate the fatigue of their eyes.