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aberration
aberration
aberration In physics, defect in lens and mirror images arising when the incoming light does not fall at or near the centre of the lens or mirror.
Spherical aberration occurs when rays falling on the periphery of a lens or mirror are not brought to the same focus as light at the centre; the image is blurred.
Chromatic aberration occurs when the wavelengths of dispersed light are not brought to the same focus; the image is falsely coloured.
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Aberration-free IOL offers superior optical performance
Magazine article from: Ophthalmology Times; 10/15/2004; ; 700+ words
; ...decentered by 0.5 to 1 mm, the aberration-free lens outperformed the modified...views because non-axisymmetrical aberrations, such as coma and astigmatism...no splaying of the curve with an aberration-free IOL because it is immune...
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Negative spherical aberration after CK is desirable
Magazine article from: Ophthalmology Times; 10/1/2004; ; 700+ words
; ...Greater degree of negative spherical aberration seen with great number of spots applied San Diego-Inducing negative spherical aberration may be desirable after conductive keratoplasty...that patients with negative spherical aberration after CK met the target refractive error...
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New aspheric IOL designed to avoid inducing aberrations
Magazine article from: Ophthalmology Times; 1/1/2006; ; 700+ words
; ...spherical aberrations rather than...spherical aberration of the cornea...internal aberrations, the investigators...spherical aberration, the AO...spherical aberration Z4 (4...internal aberrations were high...
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New method for presenting ocular aberrations more user-friendly
Magazine article from: Ophthalmology Times; 11/1/2002; ; 700+ words
; ...higher-order aberration, to illustrate...different aberrations can have different...describing aberrations, noted that...spherical aberration represent...of only one aberration in isolation...Clinically, aberrations can exist...
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Larger optical zone minimizes higher-order aberrations
Magazine article from: Ophthalmology Times; 2/1/2004; ; 700+ words
; ...to minimize total higher-order aberrations after LASIK, said Barrie D. Soloway...evaluated the higher-order aberration profiles of spherical and spherocylindrical...spherocylindrical treatments, higher-order aberrations decreased with increasing optical...
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Wavefront analysis measures higher-order eye aberrations
Magazine article from: Ophthalmology Times; 5/1/2001; ; 700+ words
; ...The second, the aberration map, has subtracted...the higher-order aberrations. The system also displays...called the Optical Aberration Index (OAI), so...the AcuityMap, the aberration map, and the patient...effects of higher-order aberrations on visual function...
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Increasing scan diameter dramatically affects higher-order aberration measurements
Magazine article from: Ophthalmology Times; 3/1/2004; ; 700+ words
; ...values for higher-order aberrations. "Therefore, we conclude...ultimately treat wavefront aberration over the largest pupil diameter...subsequently to treat many aberrations-including spherical aberration that can have an important...
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Design selection and classification for Hadamard matrices using generalized minimum aberration criteria.
Magazine article from: Technometrics; 5/1/2002; ; 700+ words
; ...two criteria of generalized minimum aberration for general two-level fractional factorial...further studied by linking generalized aberration with the criteria of efficiency and...Our studies reveal that generalized aberration performs quite well under these familiar...
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Higher-order aberration interactions with customized ablations need to be neutralized
Magazine article from: Ophthalmology Times; 6/1/2006; ; 700+ words
; ...to have thirdorder aberrations or more positive spherical aberration preoperatively...MacRae showed that the aberration interaction also goes...preoperative spherical aberration as well as third-order aberrations affecting sphere...
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SIRAC: Supervised Identification of Regions of Aberration in aCGH datasets.(Research article)
Magazine article from: BMC Bioinformatics; 10/30/2007; ; 700+ words
; ...for the common aberrations between the samples...chromosomal regions of aberration is a task in itself...that carry the aberration [6, 8, 14...15] require the aberrations to be present in...when computing the aberration frequency across...phase also the aberrations common to more...
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spherical aberration
Book article from: A Dictionary of Astronomy
spherical aberration A defect of mirrors and lenses in which...those close to the axis. Spherical aberration is seen in the images formed by spheroidal...star image suffering from spherical aberration has no unique focus but instead has...
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aberration
Book article from: World Encyclopedia
aberration In physics, defect in lens and mirror...centre of the lens or mirror. Spherical aberration occurs when rays falling on the periphery...centre; the image is blurred. Chromatic aberration occurs when the wavelengths of dispersed...
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chromatic aberration
Book article from: A Dictionary of Astronomy
chromatic aberration False colour in a refracting optical system...focal ratio of a lens, the less chromatic aberration it will show. Early telescopes were made...achromatic lens was invented to overcome chromatic aberration.
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constant of aberration
Book article from: A Dictionary of Astronomy
constant of aberration See annual aberration .
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elliptic aberration
Book article from: A Dictionary of Astronomy
elliptic aberration See e-terms .
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