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https://www.readbyqxmd.com/read/28642460/standing-wave-effect-and-fractal-structure-in-dislocation-evolution
#1
P Li, Z F Zhang
Theoretical model required for the evolution of regular dislocation pattern should simultaneously take into account both static distribution and dynamic evolution of dislocation pattern. In principle, there exists a stable uniformly moving dislocation with both core and far field advancing at the same constant velocity, which suggests the existence of the traveling waves representing moving dislocation. Therefore, one new term "dislocation wave" is defined by simultaneously consisting of both an elastic wave and a dislocation in each wavefront...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28640145/comparison-of-implantable-collamer-lens-visian-icl-v4-and-icl-v4c-for-high-myopia-a-cohort-study
#2
Ying Tian, Hai-Bo Jiang, Jian Jiang, Dan Wen, Xiao-Bo Xia, Wei-Tao Song
The aim of this study was to investigate the visual quality of the 2 kinds of intraocular lens: Visian implantable collamer lens (ICL) V4 and Visian ICL V4c implantations for high myopia.Twenty cases (20 eyes) with high myopia who received Visian ICL V4 implantation and 18 cases (18 eyes) with high myopia who received Visian ICL V4c implantation in our hospital from April 1, 2014 to November 31, 2016 were enrolled. In 1-month follow-up, near vision, best corrected distant visual acuity (BCVA), uncorrected distant visual acuity (UDVA), and wavefront aberrations were measured, and compensation factor was calculated...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28631305/two-years-results-of-small-incision-lenticule-extraction-and-wavefront-guided-laser-in%C3%A2-situ-keratomileusis-for-myopia
#3
Hidenaga Kobashi, Kazutaka Kamiya, Akihito Igarashi, Masahide Takahashi, Kimiya Shimizu
PURPOSE: To compare the 2-years visual and refractive outcomes between small-incision lenticule extraction (SMILE) and wavefront-guided laser in situ keratomileusis (LASIK) in eyes with myopia and myopic astigmatism. METHODS: Our retrospective case-control study examined 30 eyes of 30 patients with the manifest refraction spherical equivalent (MRSE) of -3.71 ± 1.83 dioptres (D) who underwent SMILE and 30 eyes of 30 patients with MRSE of -3.81 ± 1.40 D who underwent wavefront-guided LASIK...
June 20, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28615923/changes-in-meibomian-gland-morphology-and-ocular-higher-order-aberrations-in-eyes-with-chalazion
#4
Shima Fukuoka, Reiko Arita, Rika Shirakawa, Naoyuki Morishige
PURPOSE: To examine the changes in meibomian gland morphology and ocular higher-order aberrations (HOAs) in eyes with chalazion and its excision. METHODS: Seven male patients with previous history of chalazion excision and seven control male subjects were enrolled. Changes in meibomian gland morphology (meiboscores, gland dropout, and shortening) were evaluated by using meibography equipped in a wavefront analyzer KR-1W and in a slit-lamp device BG-4M. Ocular HOAs were measured sequentially with KR-1W...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28613179/unsupervised-learning-of-spike-pattern-for-seizure-detection-and-wavefront-estimation-of-high-resolution-micro-electrocorticographic-%C3%AE-ecog-data
#5
Yilin Song, Yao Wang, Jonathan Viventi
For the past few years, we have developed flexible, active, multiplexed recording devices for high resolution recording over large, clinically relevant areas in the brain. While this technology has enabled a much higher-resolution view of the electrical activity of the brain, the analytical methods to process, categorize and respond to the huge volumes of seizure data produced by these devices have not yet been developed. In this work we proposed an unsupervised learning framework for spike analysis, which by itself reveals spike pattern...
June 9, 2017: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28597602/multifunctional-hyperbolic-nanogroove-metasurface-for-submolecular-detection
#6
Li Jiang, Shuwen Zeng, Zhengji Xu, Qingling Ouyang, Dao-Hua Zhang, Peter Han Joo Chong, Philippe Coquet, Sailing He, Ken-Tye Yong
Metasurface serves as a promising plasmonic sensing platform for engineering the enhanced light-matter interactions. Here, a hyperbolic metasurface with the nanogroove structure in the subwavelength scale is designed. This metasurface is able to modify the wavefront and wavelength of surface plasmon wave with the variation of the nanogroove width or periodicity. At the specific optical frequency, surface plasmon polaritons are tightly confined and propagated with a diffraction-free feature due to the epsilon-near-zero effect...
June 8, 2017: Small
https://www.readbyqxmd.com/read/28594560/reflective-metasurfaces-for-incoherent-light-to-bring-computer-graphics-tricks-to-optical-systems
#7
Alexander E Minovich, Manuel Peter, Felix Bleckmann, Manuel Becker, Stefan Linden, Anatoly V Zayats
The normal mapping technique is widely used in computer graphics to visualize three-dimensional (3D) objects displayed on a flat screen. Taking advantage of optical properties of metasurfaces, which provide a highly efficient approach for manipulation of incident light wavefront, we have designed a metasurface to implement diffuse reflection and used the concept of normal mapping to control its scattering properties. As a proof of principle, we have fabricated and characterized a flat diffuse metasurface imitating lighting and shading effects of a 3D cube...
June 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28578676/effects-of-optical-diameter-of-intraocular-lenses-with-intrascleral-fixation-on-higher-order-aberrations
#8
Daisuke Kunita, Makoto Inoue, Yuji Itoh, Naoko Matsuki, Toshiyuki Nagamoto, Akito Hirakata
BACKGROUND: Intrascleral fixation of an intraocular lens (IOL) is used in eyes that lack capsular support. The aim of the study is to determine whether a larger optical diameter IOL will decrease the higher-order aberrations (HOAs) when the haptics are extended for intrascleral fixation than a smaller diameter IOL. METHODS: Three-piece acrylic IOLs with 6.0 mm optics (X-60, VA-60BBR) and 7.0 mm optics (X-70, VA-70 AD) were fixed at lengths of 13, 14, 15, 16, or 17 mm...
June 2, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28569861/optical-path-difference-microscopy-with-a-shack-hartmann-wavefront-sensor
#9
Hai Gong, Temitope E Agbana, Paolo Pozzi, Oleg Soloviev, Michel Verhaegen, Gleb Vdovin
In this Letter, we show that a Shack-Hartmann wavefront sensor can be used for the quantitative measurement of the specimen optical path difference (OPD) in an ordinary incoherent optical microscope, if the spatial coherence of the illumination light in the plane of the specimen is larger than the microscope resolution. To satisfy this condition, the illumination numerical aperture should be smaller than the numerical aperture of the imaging lens. This principle has been successfully applied to build a high-resolution reference-free instrument for the characterization of the OPD of micro-optical components and microscopic biological samples...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28569850/tunable-time-resolved-tick-tock-pulsed-digital-holographic-microscopy-for-ultrafast-events
#10
Yu-Chih Lin, Chau-Jern Cheng, Li-Chien Lin
This study presents a time-resolved imaging technique for detecting ultrafast events in the sample with tunable tick-tock pulses in common-path digital holographic microscopy. The tick-tock pulses are generated from the same single femtosecond pulse source and manipulated through a spatial-multiplexing encoding/decoding scheme with two complementary binary codes for digital hologram recording and reconstruction. The spatial-multiplexing encoding/decoding scheme with compressive sensing on the Fresnel digital hologram is used to recover missing data and achieve high-fidelity wavefront reconstruction...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28566700/controlling-light-transmission-through-highly-scattering-media-using-semi-definite-programming-as-a-phase-retrieval-computation-method
#11
Moussa N'Gom, Miao-Bin Lien, Nooshin M Estakhri, Theodore B Norris, Eric Michielssen, Raj Rao Nadakuditi
Complex Semi-Definite Programming (SDP) is introduced as a novel approach to phase retrieval enabled control of monochromatic light transmission through highly scattering media. In a simple optical setup, a spatial light modulator is used to generate a random sequence of phase-modulated wavefronts, and the resulting intensity speckle patterns in the transmitted light are acquired on a camera. The SDP algorithm allows computation of the complex transmission matrix of the system from this sequence of intensity-only measurements, without need for a reference beam...
May 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28560652/comparative-study-of-visual-function-and-ocular-aberrations-of-two-different-one-piece-designed-hydrophilic-acrylic-intraocular-lens
#12
Yuxin Zhao, Zhaoxia Wang, Xia Tian, Xuehong Wang, Xining Gao
PURPOSE: To determine whether the aspherical IOL, Tecnis ZCB00, can improve the visual quality by measuring visual acuity, wavefront aberrations, and contrast sensitivity. METHODS: It was a retrospective case series. Patients who underwent phacoemulsification cataract surgery were divided into two groups. One group (Group TC) was implanted with one-piece aspherical acrylic IOL (Tecnis ZCB00, AMO); the other (Group SA) was implanted with one-piece spherical acrylic IOL (Sensar AAB00, AMO)...
May 30, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28555619/probing-the-early-stages-of-shock-induced-chondritic-meteorite-formation-at-the-mesoscale
#13
Michael E Rutherford, David J Chapman, James G Derrick, Jack R W Patten, Philip A Bland, Alexander Rack, Gareth S Collins, Daniel E Eakins
Chondritic meteorites are fragments of asteroids, the building blocks of planets, that retain a record of primordial processes. Important in their early evolution was impact-driven lithification, where a porous mixture of millimetre-scale chondrule inclusions and sub-micrometre dust was compacted into rock. In this Article, the shock compression of analogue precursor chondrite material was probed using state of the art dynamic X-ray radiography. Spatially-resolved shock and particle velocities, and shock front thicknesses were extracted directly from the radiographs, representing a greatly enhanced scope of data than could be measured in surface-based studies...
May 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28553070/the-use-of-wavelight-%C3%A2-contoura-to-create-a-uniform-cornea-the-lyra-protocol-part-2-the-consequences-of-treating-astigmatism-on-an-incorrect-axis-via-excimer-laser
#14
Manoj Motwani
PURPOSE: To show how an incorrect manifest astigmatism axis can cause an abnormal induced astigmatism on a new axis. PATIENTS AND METHODS: Four eyes of three patients were treated primarily with WaveLight(®) EX500 wavefront optimized (WFO) treatments for astigmatism. All four eyes needed enhancements and were analyzed retrospectively via WaveLight(®) Contoura to determine the reason for the incorrect astigmatism treatment. Two of the eyes were retreated with topographic-guided ablation, and two were treated with WFO correction...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28543106/the-concept-of-triple-wavefront-fusion-during-biventricular-pacing-using-the-egm-to-produce-the-best-acute-hemodynamic-improvement-in-crt
#15
Iris A H Ter Horst, Margot D Bogaard, Anton E Tuinenburg, Thomas P Mast, Teun P de Boer, Pieter A Doevendans, Mathias Meine
BACKGROUND: Previous reports suggest that Biventricular pacing (BiVp) fused with intrinsic conduction (BiVp-fusion, triple wavefront fusion) is associated with improved resynchronization compared to pure-BiVp in cardiac resynchronization therapy (CRT). This study aimed to assess the association between acute hemodynamic benefit of CRT and signs of BiVp-fusion by using a novel EGM-based method. METHODS: In 17 patients undergoing CRT implantation, 28 combinations of atrioventricular (AV) and interventricular (VV) delays were applied while invasively measuring acute hemodynamic response based on maximum rate of LV pressure rise (LV dP/dtmax ) to assess optimal BiVp settings...
May 23, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28538335/bigaussian-wavefront-model-for-normal-and-keratoconic-eyes
#16
Jos J Rozema, Pablo Rodríguez, Rafael Navarro, Carina Koppen
PURPOSE: To report bigaussian multivariate wavefront models capable of stochastically generating an unlimited amount of plausible wavefront data for either normal or keratoconic eyes. METHODS: The models use centroid wavefront data measured previously with an iTrace in 330 healthy right eyes and 122 keratoconic right eyes. These centroids were fitted to an 11th-order Zernike series, followed by principal component analysis to reduce dimensionality and remove correlations...
June 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28537248/measuring-the-orbital-angular-momentum-spectrum-of-an-electron-beam
#17
Vincenzo Grillo, Amir H Tavabi, Federico Venturi, Hugo Larocque, Roberto Balboni, Gian Carlo Gazzadi, Stefano Frabboni, Peng-Han Lu, Erfan Mafakheri, Frédéric Bouchard, Rafal E Dunin-Borkowski, Robert W Boyd, Martin P J Lavery, Miles J Padgett, Ebrahim Karimi
Electron waves that carry orbital angular momentum (OAM) are characterized by a quantized and unbounded magnetic dipole moment parallel to their propagation direction. When interacting with magnetic materials, the wavefunctions of such electrons are inherently modified. Such variations therefore motivate the need to analyse electron wavefunctions, especially their wavefronts, to obtain information regarding the material's structure. Here, we propose, design and demonstrate the performance of a device based on nanoscale holograms for measuring an electron's OAM components by spatially separating them...
May 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28532936/intraoperative-aberrometry-versus-preoperative-biometry-for-intraocular-lens-power-selection-in-axial-myopia
#18
Darren C Hill, Shruti Sudhakar, Christopher S Hill, Tonya S King, Ingrid U Scott, Brett B Ernst, Seth M Pantanelli
PURPOSE: To compare the accuracy of intraoperative wavefront aberrometry (ORA) and the Hill-radial basis function (RBF) formula with other formulas based on preoperative biometry in predicting residual refractive error after cataract surgery in eyes with axial myopia. SETTING: Private practice, Harrisburg, Pennsylvania, USA. DESIGN: Retrospective consecutive case series. METHODS: Eyes with an axial length (AL) greater than 25...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28530232/tomographic-active-optical-trapping-of-arbitrarily-shaped-objects-by-exploiting-3d-refractive-index-maps
#19
Kyoohyun Kim, YongKeun Park
Optical trapping can manipulate the three-dimensional (3D) motion of spherical particles based on the simple prediction of optical forces and the responding motion of samples. However, controlling the 3D behaviour of non-spherical particles with arbitrary orientations is extremely challenging, due to experimental difficulties and extensive computations. Here, we achieve the real-time optical control of arbitrarily shaped particles by combining the wavefront shaping of a trapping beam and measurements of the 3D refractive index distribution of samples...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28524133/-wavefront-aberrations-and-accommodation-in-myopes-and-hyperopes
#20
V V Neroev, E P Tarutta, S G Arutyunyan, A T Khandzhyan, N V Khodzhabekyan
AIM: to comparatively investigate accommodation, pseudoaccommodation, and higher-order aberrations in children and young adults with myopia and hyperopia. MATERIAL AND METHODS: A total of 39 myopic (the mean error of (-)5.2±1.5 diopters) and 53 hyperopic (the mean error of (+)3.1±1.15 diopters) eyes of 46 patients aged 5-20 years (11.6±0.6 years on average) were enrolled. Examination included evaluation of the objective accommodative response, relative accommodation reserves, pseudoaccommodation volume (calculated as the difference between the (+)3...
2017: Vestnik Oftalmologii
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