spherical aberration

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Related to Spherical aberrations: Chromatic aberrations

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 ?
The effect of spherical aberration in the human eye is decreased by several adaptations.
CMS recognized the TECNIS([R])1-Piece IOL (Model ZCB00) as a member of the Reduced Spherical Aberration NTIOL subset and approved the lens for reimbursement status that provides for additional Medicare reimbursement of $50 per lens for ambulatory surgical centers, which perform more than half of all cataract surgeries in the U.
Not all aspheric lenses are created the same, and other aspheric IOLs have negative spherical aberration, which could reduce depth of field.
The Afinity Collamer Aspheric IOL Model CC4204A provides outstanding optical performance, including reduced spherical aberration, and is highly biocompatible.
The Afinity Collamer Aspheric IOL Model CQ2015A produces excellent optical performance including reduced spherical aberration and achieves significant biocompatibility.
In its final notice published in the Federal Register, CMS stated, "CMS approves AMO's claims of clinical advantages and superiority of the Tecnis(R) IOL for ocular spherical aberrations and simulated night driving.
SharpStack's algorithm options include Nearest Neighbor, No Neighbor, Inverse Filter, and Spherical Aberration Correction.
A patient with excessive spherical aberrations may have problems with glare and lack of sharpness of vision, particularly under dim light conditions.
Aberrations include refractive errors such as nearsightedness, farsightedness, and astigmatism, as well as other higher order aberrations such as spherical aberrations and coma, which can cause night vision problems, glare and halos.