An aspheric lens is designed for aberration correction. With the help ofaspheric lens, the image formed is distortion free.
An aspheric lens is a lens whose surfaces profile neither a portion of a sphere nor of a circular cylinder. Since it is not spherical, the conventional processes no longer apply to making aspheric surfaces. This is why aspheric cost many times what spherical surfaces do.
In optics, a lens assembly that includes an aspheric element is often called an aspheric lens.
Benefit
The asphere’s more complex surface profile can eliminate spherical aberration and reduce other optical aberrations compared to a simple lens. A singleaspheric lens can often replace a much more complex multi-lens system. These lenses are small, lighter and in general, better than similar lenses which only employ spherical elements.
As magnifier, aspheric lens enhances image quality and minimizes distortion throughout the viewing area, it reduces distortion at wide angles, improves corner resolution. You can get more detail and high-resolution of the image.
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