Aspheric is an adjective used to describe a shape or surface that deviates from a perfect curve or sphere. It is derived from the word “asphere,” which refers to a surface that is not spherical.
In optical engineering and optics, an aspheric lens or mirror is one that has a non-spherical shape. Unlike traditional lenses, which have a perfectly curved surface, aspheric lenses are designed to correct for certain types of aberrations. By varying the curvature of the lens, an aspheric shape can reduce spherical aberration and other types of distortions, leading to improved image quality. The non-spherical profile allows for more precise manipulation of light rays, leading to enhanced performance, reduced weight, and improved cost-effectiveness.
Aspheric surfaces are also used in other fields, such as ophthalmology. Aspheric eyeglass lenses have different curvatures across the lens surface, which can correct vision problems and provide clearer optics than traditional spherical lenses. The aspheric design helps to eliminate the distortion and blurring of peripheral vision often experienced with traditional eyeglasses.
In summary, the term "aspheric" refers to a shape or surface that deviates from perfect symmetry, typically in the field of optics. It describes surfaces, lenses, or mirrors that are not perfectly curved or spherical but are intentionally designed to reduce aberrations and improve performance in various optical applications.
