Results 11 to 20 of about 14,333 (240)
Coma Influence on Manifest Astigmatism in Coma-Dominant Irregular Corneal Optics
Journal of Refractive Surgery, 2021 PURPOSE: To evaluate the influence of coma on manifest refractive cylinder (MRC) in eyes with coma-dominated corneal optics and suggest alternative guidelines for surgical planning of astigmatism correction in topography-guided ablation and toric intraocular lens (IOL) exchange surgery. METHODS:
Wen Zhou +6 more
openalex +4 more sources
Ray-based optical design tool for freeform optics: coma full-field display
Optics Express, 2016 The field of optical fabrication has progressed to a point where manufacturing optical quality freeform surfaces is no longer prohibitive. However, to stimulate the development of freeform systems, optical designers must be provided with the necessary tools. Full-field displays are an example of such a tool.
Aaron Bauer +2 more
openalex +3 more sources
Characterization of Monochromatic Aberrated Metalenses in Terms of Intensity-Based Moments
Nanomaterials, 2021 Consistent with wave-optics simulations of metasurfaces, aberrations of metalenses should also be described in terms of wave optics and not ray tracing. In this respect, we have shown, through extensive numerical simulations, that intensity-based moments
Sorina Iftimie +2 more
doaj +1 more source
Changes of high order aberrations after photorefractive keratectomy (PRK) and FemtoLASIK
Российский офтальмологический журнал, 2022 Purpose: a comparative study of corneal and total wavefront aberration changes after traditional PRK and FemtoLASIK.Material and methods. Corneal and total wavefront aberrations were studied on OPD-Scan III aberrometer (Nidek) in 63 patients (126 eyes ...
N. V. Khodzhabekyan +4 more
doaj +1 more source
Higher order aberration comparison between two aspherical intraocular lenses:MC6125AS and Akreos advanced optics [PDF]
International Journal of Ophthalmology, 2015 AIM: To compare higher order aberrations in two aspherical intraocular lenses (IOLs):Akreos advanced optics (AO) and Dr. Schmidt Microcrystalline 6125 aspheric anterior surface (MC6125AS) with each other.METHODS: Forty eyes of 39 patients underwent ...
Mohammad Taher Rajabi +6 more
doaj +1 more source
Indian Journal of Ophthalmology, 2022 Purpose: To assess impact of tear optics on repeatability of a Scheimpflug device with a Hartmann Shack aberrometer and a ray tracing aberrometer. Methods: One hundred healthy and 100 postrefractive surgery eyes underwent dry eye evaluation including ...
GairikKundu +6 more
doaj +1 more source
Recent advances of wide-angle metalenses: principle, design, and applications
Nanophotonics, 2021 Optical imaging systems, like microscopes, cameras, and telescopes, continue to expand the scope of human observation of the world. As one of the key indicators of imaging systems, the field-of-view (FOV) is often limited by coma aberration. Expanding it
Luo XianGang +5 more
doaj +1 more source
Optical Pupil Shift Correction Method for Large Ground-Based Optical Telescopes
Applied Sciences, 2023 Cassegrain telescopes with larger apertures suffer significant optical pupil shifting errors caused by gravity and temperature gradients. This study constructs an optical model of a large Cassegrain telescope and a method to calculate and compensate its ...
Honghao Wang +4 more
doaj +1 more source
Nature Communications, 2023 Visible light optical elements such as lenses and mirrors have counterparts for X-rays. In the visible regime, a variable focusing power can be achieved by an Alvarez lens which consists of a pair of inline planar refractors with a cubic thickness ...
Vishal Dhamgaye +6 more
doaj +1 more source
A coma-free super-high resolution optical spectrometer using 44 high dispersion sub-gratings [PDF]
Scientific Reports, 2021 AbstractUnlike the single grating Czerny–Turner configuration spectrometers, a super-high spectral resolution optical spectrometer with zero coma aberration is first experimentally demonstrated by using a compound integrated diffraction grating module consisting of 44 high dispersion sub-gratings and a two-dimensional backside-illuminated charge ...
Hua-Tian Tu +17 more
openaire +3 more sources