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.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The structure of the lighting unit only consists of a spherical reflector and a primary lens which comprises an aspheric surface and a spherical surface.
The optic zone diameter is 6.15 mm and incorporates a diffractive aspheric front surface and a posterior aspheric surface with a negative spherical aberration of -0.11 microns for a 6.0 mm pupil diameter.
The experimental results showed that the two-axis UV polishing could polish the aspheric surface roughness of a tungsten carbide mold to Rz 8 nm.
The retinal image size is reduced due to the aspheric surface and flatter base curve; care must be taken to order both lenses from the same manufacturer to ensure that any MAR coatings or tints match.
In paper [7], an improved phase retrieval algorithm is proposed to overcome the measurement and calculation difficulty for aspheric surface.
The biggest challenge I faced making this scope was ensuring that the secondary's aspheric surface was a smooth figure of revolution.
Roberts, "Characterization of the inherent error in a spherically-biased corneal topography system in mapping a radially aspheric surface," Journal of refractive and corneal surgery, vol.
The human cornea is neither a true spherical, nor a true toric surface, but is a relatively complex aspheric surface with the degree of asphericity varying in each of the principle meridians.