Astigmatism is often aggravated by poor eye posture. For example, lying down to read a book, or even squinting or squinting to see something can cause improper pressure on the eyelids and affect their normal, so quitting bad habits is the only way to prevent astigmatism and eliminate myopia. These habits are also often the cause of myopia, so some people think that myopia causes astigmatism, but in fact the two are not related. Astigmatism is when the parallel rays of light entering the eye are not in focus in one cross section. Ordinary spectacle lenses can only correct regular astigmatism, while irregular astigmatism can not be corrected with it, the best way is to use rigid corneal contact lenses to correct, the effect is better. The effect of correcting regular astigmatism with ordinary lenses is not the same, the greater the astigmatism the worse its effect, below moderate astigmatism can generally be corrected to normal values, while high astigmatism is more difficult to correct to good effect. In particular, high hyperopic astigmatism, seeing far and near can not rely on adjustment to see objects, if not corrected early in early childhood, the development of visual function will be inhibited to a certain extent, and when you grow up with corrective glasses, corrected vision will be worse, often forming moderate amblyopia. Highly myopic astigmatism is better, although not clear to see far, but also better to see near, visual function can still get some exercise is not completely inhibited, corrected vision is generally better than highly hyperopic astigmatism. But also need to be corrected as soon as possible with glasses. No matter what kind of high astigmatism, the earlier the correction, the better the effect. Because correction early, not only can promote the development of visual function, and object deformation and spatial positioning error response to be smaller, the patient can also tolerate the degree.