aspherical


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aspherical 

Literally 'not spherical' but this term is usually restricted to surfaces of revolution having identical but non-circular (e.g. parabolic) sections in all meridians (British Standard). See aspherical lens.
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An aspherical lens corrects for that distortion because of its machined surface geometry, which reflects the light across the lens onto a single focal point, producing an in-focus and clear image.
Before an aspherical lens is mounted to its body, it goes through an ultrasonic bath to ensure there is no debris, recieves an antireflective coating, and is inspected for dust and cosmetic issues.
Sixty seven patients (32 men and 35 women, 134 eyes) who underwent LASIK guided by aspherical ablation at the Guizhou Ophthalmic Hospital of the Affiliated Hospital of Zunyi Medical College from March 2010 to March 2011 with 4 years followup after surgery were included in this study.
6m aspherical secondary mirror was required, which would itself be made from 216 segments.
2-millimeter IR varifocal lens features aspherical optics to provide a fast F1.
The workpiece is routed around the periphery of the grinding wheel by X- and Z-axis interpolation to produce either a spherical or an aspherical shape.
We study the string topology BV algebra of aspherical manifolds.
The glass AR coated aspherical lens may be adjusted to produce either a collimated beam or focused spot.
manufacturer of high-performance molded glass and has over 20 years of experience molding visible and near-infrared aspherical optics.
Now that many pulsars have been observed racing across interstellar space at several hundred kilometers per second, astronomers realize that the core-collapse supernovae giving birth to these objects are often aspherical.
1 megapixel PowerShot S70 digital still camera features Canon's exclusive "UA lens" technology (ultra-high refractive index glass moulded aspherical lens), and a versatile 28- 100mm zoom lens.
Investigations into arrangements of spheres date back centuries, but research into how efficiently aspherical objects aggregate has received scant attention.