Aspherical surface

Aspherical surface
An Aspherical lens surface possesses more than one radius of curvature, which allows for the correction of lens aberrations common in simpler lens designs.

-Aspherical surface - lens surface with more than one radius of curvature, i.e. the surface does not form part of a sphere.

Aspherical surface
A lens surface that possesses more than one radius of curvature. The aspherical elements compensate for the multitude of lens aberrations common in simpler lens designs.

of light that would pass through far from the center, where the lens glass may less closely approximate (usually with various easy-to-make spherical surfaces) the shapes that would focus it perfectly (usually much more complex aspherical surfaces), ...

See also: Light, Element, Lenses, Aspherical, Time