Results 291 to 300 of about 643,248 (351)
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Journal of refractive surgery, 2020
PURPOSE To evaluate the use of the VAO adaptive optics visual simulator (Voptica SL, Murcia, Spain) for customization of spherical aberration to increase depth of focus. METHODS Through-focus visual acuity with both high- and low-contrast letters from +
Lucía Hervella +3 more
semanticscholar +1 more source
PURPOSE To evaluate the use of the VAO adaptive optics visual simulator (Voptica SL, Murcia, Spain) for customization of spherical aberration to increase depth of focus. METHODS Through-focus visual acuity with both high- and low-contrast letters from +
Lucía Hervella +3 more
semanticscholar +1 more source
General formula to design a freeform singlet free of spherical aberration and astigmatism.
Applied Optics, 2019In this paper, an analytical closed-form formula for the design of freeform lenses free of spherical aberration and astigmatism is presented. Given the equation of the freeform input surface, the formula gives the equation of the second surface to ...
Rafael G. González-Acuña +2 more
semanticscholar +1 more source
Calculation model of dense spot pattern multi-pass cells based on a spherical mirror aberration.
Optics Letters, 2019We report a novel calculation model for dense spot pattern multi-pass cells consisting of two common identical spherical mirrors. A modified ABCD matrix without the paraxial approximation was developed to describe the ray propagation between two ...
Ruyue Cui +8 more
semanticscholar +1 more source
Intermediate Spherical Aberration
Optical Engineering, 1986A comparison is made between geometric and diffractive parameters of interest for intermediate spherical aberration. The purpose is to identify the transition region where the validity of one gives way to the other so that a best image plane can always be defined by using one of the criteria.
Phillip Peterson, Joseph M. Geary
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Age-Related Changes in Corneal Spherical Aberration.
Journal of refractive surgery, 2018PURPOSE To analyze the age-related changes in corneal spherical aberration (CSA) and higher order aberrations (HOAs) and to develop a novel model to estimate the change in CSA with age.
Dhanishta Kemraz +6 more
semanticscholar +1 more source
Optical Engineering, 1986
Experimental and theoretical diffraction intensities are studied for large spherical aberrations ranging from 5X to 50X. In addition, diffractive and geometric rms spot sizes are compared. The experiments and analysis show that for large spherical aberrations there is a core near-axis intensity region that is independent of the aperture radius. This is
Phillip Peterson, Joseph M. Geary
openaire +1 more source
Experimental and theoretical diffraction intensities are studied for large spherical aberrations ranging from 5X to 50X. In addition, diffractive and geometric rms spot sizes are compared. The experiments and analysis show that for large spherical aberrations there is a core near-axis intensity region that is independent of the aperture radius. This is
Phillip Peterson, Joseph M. Geary
openaire +1 more source
Spherical aberration: Friend or Foe ?
Acta Ophthalmologica, 2011AbstractPurpose To determine the level of residual spherical aberration that gives the best objective and subjective quality of image after cataract surgery with intraocular lens (IOL) implantation.Methods Six months after microincision (1.8 mm) cataract surgery with aspheric IOL implantation, total aberrations were computed using a Wavescan ...
G VANDERMEER, Y NOCHEZ, PJ PISELLA
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THE SPHERICAL ABERRATION OF THE EYE
Optometry and Vision Science, 1949The spherical aberration of the eye was measured by placing a series of centered annular apertures over the eye pupil, and determining the optimum spectacle correction for each aperture. A “double star” was used as a test object. Accommodation was controlled by reflecting a second test object into the field of view. The three eyes examined had positive
M, KOOMEN, R, TOUSEY, R, SCOLNIK
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Errata: Intermediate Spherical Aberration
Optical Engineering, 1987Detail in the spot diagrams of Fig. 12 was lost in reproduction of the published paper. The figure is reproduced here in its entirety with improved detail in the spot diagrams. The following discussion further explains the figure.
Phillip Peterson, Joseph M. Geary
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Spherical aberration and binocularity
Acta Ophthalmologica, 2012AbstractPurpose To evaluate the effect of different combinations of spherical (SA4) and secondary spherical (SA6) aberration on each eye on binocular subjective quality of vision.Methods A numerical eye model was used to generate images (ie three 0.4 logMAR high contrast letters) viewed through a 4.7mm pupil diameter and degraded by various spherical ...
G VANDERMEER +4 more
openaire +1 more source