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.
References in periodicals archive ?
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.
Numerical Control Interpolation Algorithm of Aspheric Surface Based on the Genetic Algorithms and Neural Network
One of the technical highlights is the plastic "combiner" screen, which has an aspheric surface.
31) In an attempt to minimise these symptoms, many MIOL designs incorporate an aspheric surface to maximise contrast sensitivity and visual function.
Clinical studies have not been conducted with the Akreos Advanced Optics Aspheric lens to assess the effect of the added aspheric surface to the parent lens model Akreos on spherical aberration, visual acuity and contrast sensitivity.
Therefore an aspheric surface is spherical at the very centre but becomes astigmatic away from the optical centre.
The hydrophobic acrylic material helps lower chromatic dispersion for improved vision and the lens uses a patented, wavefront-designed aspheric surface to compensate for spherical aberration of the cornea.
Interferometric asphere metrology has traditionally required the use of a null lens or computer-generated hologram that must be specially designed for each different aspheric surface.
Unilens contact lenses have a unique aspheric surface that corrects vision needs without the dependence on lens orientation, image selection or image suppression, which have been issues with bifocal contact lenses.
Current optical design of optical instruments is based on conic or aspheric surfaces of revolution (both on-axis and off-axis).
The Crystalens AO has prolate aspheric surfaces and is designed to be free of spherical aberration.