aspheric surface

aspheric surface

(ay-sfe -rik) Any surface that does not form part of a sphere. A paraboloid reflector, used in both optical and radio telescopes, is aspheric. Although production costs are high, aspheric surfaces can greatly improve lens and mirror performance.

aspheric surface

[ā′sfir·ik ′sər·fəs] (optics) A lens or mirror surface which is altered slightly from a spherical surface in order to reduce aberrations.