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 ?
Table-II: The induced change in mean RMS and Stanadard deviation of Total HOAs, Coma and Spherical aberrations.
24 found the ratio of post LASIK RMS of spherical aberrations to pre LASIK RMS of spherical aberrations to be 3.
1) Spherical aberration reduces VA when the pupil is dilated at night but it is not noticed in practice because rod activity predominates only at low levels of illumination.
The third, fourth and fifth orders (also known as trefoil, quatrefoil and pentafoil) describe coma, spherical aberration and secondary astigmatism, and secondary coma, respectively.
As the illuminated portion gets bigger, the astigmatism and spherical aberration grow.
Mean RMS value of HOAs, coma and spherical aberrations was calculated in all four groups.
Conclusions: In overall comparison the mean RMS of total HOAs and spherical aberrations was significantly increased in hypermetropia group and there was a statistically significant negative correlation of SE of hypermetropia with RMS of total HOAs and spherical aberration.
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.
Spherical aberrations of intraocular lenses increase as its optical power increases.
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.
SharpStack's algorithm options include Nearest Neighbor, No Neighbor, Inverse Filter, and Spherical Aberration Correction.