aberration

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Related to spherical aberration: coma aberration
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29) If spherical aberration cannot be avoided, then a numerical correction should be applied to the depth scale to account for the shift of the laser focus deeper into the sample.
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.
Spherical aberration causes parallel light rays passing through the edge of a lens to converge at a focal point closer to the lens than light rays passing through the center of the lens.
Hubble's spherical aberration had smeared incoming light, preventing the telescope from clearly viewing faint galaxies or distinguishing individual stars in crowded clusters.
The provision of a transmission electron microscope 300 kv ultra high-resolution emission gun type field "cold feg" with spherical aberration corrector in the objective lens, computer control and closed circuit cooling
This results in increased central optical power of the lens and reduces spherical aberration.
And although that second test precisely identified the spherical aberration, its finding was ignored.
This system compensates for astigmatic aberration and spherical aberration, and provides extremely high optical performance from infinity to 1:1 macro.
However, we did note that the image degraded towards the edges and some spherical aberration was present.
Those errors, the panel says, led to the spherical aberration that today renders Hubble's primary mirror virtually useless -- without corrective lenses -- for resolving faint, distant objects in the universe.
PACEM is based on a ZEISS LIBRA 200 TEM with additional optics to correct spherical aberration (Cs corrector).
Approximately 3-8% of patients implanted with monofocal IOLs will achieve good near vision (adequate for reading newspaper print) due to pseudoaccommodative effects including pupil miosis and increased depth-of-field; chromatic aberration; monochromatic higher order aberrations such as spherical aberration and coma; corneal multifocality; low myopia and against-the-rule myopic astigmatism.