Results 151 to 160 of about 5,505 (209)

Retinal Vascular Diseases Highlighted by Adaptive Optics Ophthalmoscopy. [PDF]

Rom J Ophthalmol
Mirescu AE, Deleanu DG, Baltă G, Tofolean IT, Baltă F, Cristescu IE, Jurja S.   +6 more
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Optical Bench Evaluation of the Latest Refractive Enhanced Depth of Focus Intraocular Lens. [PDF]

Clin Ophthalmol
Schmid R, Borkenstein AF.
europepmc   +1 more source

Quantifying monochromatic and polychromatic optical blur anisotropy in the periphery of myopes and emmetropes using a radial asymmetry metric. [PDF]

Front Med (Lausanne)
Degre Kendrick C, Pusti D, Yoon G.
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COACH-based Shack-Hartmann wavefront sensor

OSA Imaging and Applied Optics Congress 2021 (3D, COSI, DH, ISA, pcAOP), 2021
A new Shack-Hartmann wavefront sensor (SHWS) based on the principle of coded aperture correlation holography is used to achieve higher precision. Coded phase masks are employed to create sparse dot patterns in the sensor plane.
Nitin Dubey, Ravi Kumar, Joseph Rosen
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Reference-free Shack–Hartmann wavefront sensor

Optics Letters, 2011
The traditional Shack-Hartmann wavefront sensing (SHWS) system measures the wavefront slope by calculating the centroid shift between the sample and a reference piece, and then the wavefront is reconstructed by a suitable iterative reconstruction method. Because of the necessity of a reference, many issues are brought up, which limit the system in most
Liping, Zhao, Wenjiang, Guo, Xiang, Li, I-Ming, Chen   +3 more
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Holographic Shack-Hartmann wavefront sensor

2010 International Conference on Advanced Optoelectronics and Lasers, 2010
Principles of constructing the holographic wavefront sensors are considered. Method of production of the two-channel holographic lenslet arrays with compensation of specified aberrations and its parameters are presented. The possibility of adaptation of the holographic sensor for measuring the wave fronts with different curvature is shown.
Dmytro V. Podanchuk, Volodymyr P. Dan'ko, Myhailo M. Kotov   +2 more
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RGB Shack–Hartmann wavefront sensor

Journal of Modern Optics, 2008
The Shack–Hartmann wavefront sensor is the most widely used instrument to measure the optical aberrations of the human eye. Traditional Shack–Hartmann wavefront sensors measure the ocular aberrations at a single wavelength, which is usually in the near infrared region of the spectrum.
Prateek Jain, Jim Schwiegerling
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PSD-based Shack-Hartmann wavefront sensor

SPIE Proceedings, 2004
A novel PSD-based Hartmann-Shack wavefront sensor(HSWFS) prototype has been developed. Compared with the conventional CCD-based HSWFS, it can operate at very high sampling rate, and it only has very short readout delaytime. In this paper, the PSD-based HSWFS is described in details, and the performances of the PSD-based HSWFS and the CCD-based HSWFS ...
Kai Chen, Zeping Yang, Haiying Wang, Ende Li, Fan Yang, Yudong Zhang   +5 more
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Coherence-gated Shack-Hartmann wavefront sensor

Frontiers in Optics 2010/Laser Science XXVI, 2010
In the present paper we investigate the possibility of narrowing the depth range of a physical Shack – Hartmann wavefront sensor by using coherence gating. A low coherence interferometry (LCI) set-up is demonstrated capable of eliminating stray reflections.
Simon Tuohy, Adrian Gh. Podoleanu
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Wavefront reconstruction error of Shack-Hartmann wavefront sensors

Publications of the Astronomical Society of the Pacific, 1994
We have evaluated the wavefront reconstruction error for Shack-Hartmann wavefront sensors based on a series of simulations for various numbers of subapertures at various levels of measurement error in determining the Hartmann spot centroids. The optimum number of subapertures is derived for a given magnitude reference star in the cases of photon-noise ...
N. Takato, M. Iye, I. Yamaguchi
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