What is astigmatism

summary

My child recently found that watching TV is always very close, later the child said watching TV blurred, and the child went to the hospital ophthalmology examination, there was myopia, but also astigmatism, the following to introduce how astigmatism?

What is astigmatism

First of all, astigmatism is a kind of 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. Astigmatism is caused by the uneven thickness of the cornea or the uneven curvature of the cornea, which makes the refractive rate of the meridians of the cornea inconsistent, 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.

Secondly, regular astigmatism is mostly caused by congenital abnormal changes of cornea, and there may be lens astigmatism. There are also some acquired astigmatism, such as long eyelid needle eyes or miliary swelling, long-term eye posture is not good (such as often squinting, rubbing eyes, lying reading, etc.), so the eyelid pressure on the cornea will also change the corneal radian, astigmatism and increase the degree of astigmatism. In addition, some eye surgery such as cataract and corneal surgery may also change the degree and axis of astigmatism. Irregular astigmatism is mainly caused by the uneven corneal refractive surface, such as corneal ulcer, scar, keratoconus, pterygium and so on.

Finally, blurred vision is closely related to the degree and manner of astigmatism. People with mild astigmatism usually have normal vision, but they may have headache, eye fatigue and blurred vision when looking at objects at a certain distance. People with severe astigmatism have blurred and distorted vision. I don't know how to look far or near. I work in close distance for a little longer, i.e. eye distension, headache, reading or ghosting. This is also a common situation after astigmatism, especially when we look at the lights at night, and we often feel that we can't see clearly.

matters needing attention

In the case of astigmatism, we should pay attention to, mainly in the usual time to pay attention to conditioning, how far to see the eyes, but also to reduce close reading, watching TV time, can do eye exercises at rest, serious cases to wear glasses in time.