Severe astigmatism has different consequences for people of different ages, as follows: 1. For children within the period of visual development, usually within 12 years of age, especially within three years of age, if most of the astigmatism will cause the child’s visual objects to always be unclear, which will cause a delay in visual development during the period of visual development. If there is no correction, this is commonly referred to as amblyopia. The reason why screening the child’s vision is to find out early whether there is astigmatism or large high degrees of refractive error, fearing the occurrence of amblyopia, to early intervention, the later effect is more ideal. 2, for myopic people, astigmatism because also no clear image, will cause the development of myopia, so generally to astigmatism full correction. For people over 18 years old, the degree is more stable, for adults, a large degree of astigmatism may cause visual unclear, see things with double vision or blurred, as long as after the frame glasses, contact lenses, rigid RGP, and even surgical methods to solve, most of them can get satisfactory visual results.