Functions: Full femtosecond laser, full laser, excimer laser myopia correction, high myopia IOL implantation, youth myopia prevention and control, keratoplasty and cone cornea RGP fitting. The word “non-” means “not”, and aspheric means “not spherical”. Why do we need “aspheric lenses” and “aspheric IOLs” when spherical lenses are better? As a matter of fact, a perfectly spherical lens does not give the ideal optical effect, the light rays around the lens and the light rays in the center of the lens do not focus on one point, which we call spherical aberration. Our human cornea and lens are an aspheric refractive body, the cornea from the center to the periphery gradually become flattened, the shape of the long oval (Q < 0)< span="">, the vast majority of the performance of the positive spherical aberration, the lens for the young for the negative spherical aberration, to compensate for each other. When we perform cataract surgery, the implanted aspheric IOL can have negative or zero spherical aberration, or at least can no longer bring in positive spherical aberration. Similarly, for lenses, myopic lenses, in addition to the appearance of the periphery can become thinner, the eye through the edge of the lens oblique vision clarity than spherical lenses, so that the clear field of vision is greatly increased. Contact lenses are designed to be aspheric in order to achieve a good fit with the cornea and to enhance the stability and centering of the lens.