spherical aberration


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Related to spherical aberration: coma aberration

aberration

 [ab″er-a´shun]
1. deviation from the normal or usual.
2. imperfect refraction or focalization of a lens.
chromatic aberration unequal refraction by a lens of light rays of different lengths passing through it, producing a blurred image and a display of colors.
dioptric aberration (spherical aberration) inability of a spherical lens to bring all rays of light to a single focus.
ventricular aberration aberrant ventricular conduction.

spherical aberration

Aberration or distortion of an image due to rays entering the peripheral portion of a spherical mirror or lens being refracted differently from those closer to the center. Thus the peripheral rays are focused on the optical axis at a different point from the central rays.
See also: aberration

aberration

1. deviation from the normal or usual.
2. imperfect refraction or focalization of a lens, e.g. the lens of the eye.

chromatic aberration
inability to focus a pencil of light through a lens because of the different refrangibilities of the colored constituents of white light. In an optical instrument such as a microscope this represents an error in the lens system.
spherical aberration
that due to failure of a spherical mirror to focus all the light rays at one point; a fault of construction in an optical instrument.
References in periodicals archive ?
While the measured spherical aberration values were under two waves at all manufacturing settings, the measured coma values for PS parts at three different manufacturing conditions were not.
20) It ordered its personnel and the Space Telescope Science Institute not to say anything about the spherical aberration.
As the illuminated portion gets bigger, the astigmatism and spherical aberration grow.
Ethnic differences in higher-order aberrations: Spherical aberration in the South East Asian Chinese eye.
Traditional Czerny-Turner imaging spectrographs are subject to imaging aberrations such as coma, astigmatism and spherical aberration.
The aspheric base eliminates spherical aberration, allowing for greater image quality.
Spherical aberration and curvature of field are two other things to look for you can find using the Zeiss test chart.
He introduces basic optics, then describes performing astigmatism analysis, administering aspheric treatments that reduce spherical aberration after surgery, making calculations for vertex distance and refraction as well as intraocular lens power, performing intraocular lens calculations after surgery, correcting presbyopia surgically, understanding recent optical improvements in excimer laser surgery and getting ready for more, working with Zernike and Fourier polynomials, learning to use the concepts of ocular and topographic wavefront, and using neural adaptation to correct vision.
Such aberrations include curvature of field, spherical aberration, lateral chromatic aberration, distortion and coma.
Weiler, repairs made by astronauts last month have corrected the spherical aberration in Hubble's primary mirror, making the telescope the worldclass observatory astronomers had always hoped for.
Meanwhile, the third project partner, CEOS, having a lot of expertise in the development of advanced electron optical systems, is focusing its efforts on a new optimized corrector to compensate the chromatic and the spherical aberration for low voltages.
Invitation to tender : 300kV high-resolution transmission electron microscope (TEM) with field emission source, spherical aberration corrector, EDX and EEL spectrometers for elemental analysis and possible answer th for conducting in-situ experiments.