keyword
MENU ▼
Read by QxMD icon Read
search

higher-order aberrations

keyword
https://www.readbyqxmd.com/read/28816867/peripheral-refraction-and-aberration-profiles-with-multifocal-lenses
#1
Cathleen Fedtke, Klaus Ehrmann, Varghese Thomas, Ravi C Bakaraju
SIGNIFICANCE: The amount of central or peripheral myopic shift, as induced by different multifocal contact lenses when viewing objects at distance or near, may provide insights on the potential efficacy for slowing eye growth. PURPOSE: The present study aims to compare peripheral refraction and higher-order aberration profiles of four multifocal contact lenses with a single vision control lens. METHODS: Thirty-five myopes (age 21.2 ± 2.1 years) completed the trial, of whom 16 wore Air Optix Aqua and Proclear Multifocal Distance and Near (group 1, spherical equivalent: -2...
August 14, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28816865/liquid-crystal-spatial-light-modulators-for-simulating-zonal-multifocal-lenses
#2
Yiyu Li, Arthur Bradley, Renfeng Xu, Pete S Kollbaum
SIGNIFICANCE: To maximize efficiency of the normally lengthy and costly multizone lens design and testing process, it is advantageous to evaluate the potential efficacy of a design as thoroughly as possible prior to lens fabrication and on-eye testing. The current work describes an ex vivo approach of optical design testing. PURPOSE: The aim of this study was to describe a system capable of examining the optical characteristics of multizone bifocal and multifocal optics by subaperture stitching using liquid crystal technologies...
August 14, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28801659/relationship-between-higher-order-wavefront-aberrations-and-natural-progression-of-myopia-in-schoolchildren
#3
Takahiro Hiraoka, Junko Kotsuka, Tetsuhiko Kakita, Fumiki Okamoto, Tetsuro Oshika
This study investigated the relationship between higher-order aberrations (HOAs) and myopia progression as well as axial elongation in schoolchildren. We examined cycloplegic refraction, axial length, and wavefront aberrations prospectively in 71 myopic children. Changes in cycloplegic refraction and axial length during a 2-year study period were assessed, and their correlations with HOA components were analyzed. Sixty-four subjects ([mean ± SD] 9.2 ± 1.6 years) completed the 2-year examinations. Cycloplegic refraction was significantly changed after 2 years (P < 0...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28799080/visual-acuity-and-corneal-higher-order-aberrations-after-ex-press-or-trabeculectomy-and-the-determination-of-associated-factors-that-influence-visual-function
#4
Nobuko Kobayashi, Kazuyuki Hirooka, Eri Nitta, Kaori Ukegawa, Akitaka Tsujikawa
PURPOSE: This study investigated postoperative visual acuity and corneal higher-order aberrations following EX-PRESS or trabeculectomy. METHODS: Out of 56 eyes of 56 patients analyzed, 30 eyes were treated using trabeculectomy, while 26 eyes were treated with EX-PRESS. Visual acuity and corneal higher-order aberrations were analyzed in both groups before and at 2 weeks, 1, 2, and 3 months after the surgeries. Risk factors that could potentially influence corneal higher-order aberrations were evaluated...
August 10, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28791057/evaluation-of-changes-in-visual-acuity-contrast-sensitivity-and-aberrations-in-patients-with-keratoconus-after-corneal-collagen-cross-linking
#5
Siamak Zarei-Ghanavati, Hamid Khakshour, Mohammadreza Vejdani, Haleh Ghooshkhanei, Amirhosein Vejdani
PURPOSE: To assess and compare preoperative refractive, aberrometric, topographic, and contrast sensitivity (CS) measurements with postoperative values after corneal collagen cross-linking (CXL) in patients with progressive keratoconus. METHODS: Twenty-two eyes of 11 patients with keratoconus were enrolled in this prospective study. Uncorrected distance visual acuity (UDVA), best spectacle corrected visual acuity (BSCVA), CS, and higher order aberrations (HOAs) were evaluated at baseline and 1, 3, 6, and 8 months after surgery...
July 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28777102/preoperative-higher-order-aberrations-must-be-considered-in-determination-of-visual-performance
#6
Hossein Aghaei, Rama Pourmatin
No abstract text is available yet for this article.
August 2, 2017: Cornea
https://www.readbyqxmd.com/read/28771544/comparison-of-postoperative-visual-quality-after-smile-and-lasek-for-high-myopia-a-1-year-outcome
#7
Xiaoyu Zhu, Leilei Zou, Manrong Yu, Chen Qiu, Minjie Chen, Jinhui Dai
PURPOSE: To compare the 1-year outcome of visual quality after laser-assisted subepithelial keratomileusis (LASEK) and femtosecond laser-assisted small incision lenticule extraction (SMILE) for high myopia correction. MATERIALS AND METHODS: This prospective, comparative study included 24 eyes of 24 patients in the LASEK group, with a mean spherical equivalent (SE) of -7.59 ± 1.32 diopters, and 26 eyes of 26 patients in the SMILE group, with a mean SE of -7.91 ± 1...
2017: PloS One
https://www.readbyqxmd.com/read/28745650/-comparative-analysis-of-corneal-aberrations-after-intrastromal-segments-and-myoring-implantation-using-femtosecond-laser-in-patients-with-keratoconus
#8
N P Pashtaev, N A Pozdeeva, M V Sinitsyn
AIM: to comparatively analyze corneal aberrations after intrastromal corneal segments (ICS) and MyoRing implantation using femtosecond laser in patients with stage II-III keratoconus (KC) by Pentacam examination. MATERIAL AND METHODS: We have operated on 135 patients (145 eyes) with stage II or III KC. Depending on surgical technique, all patients were divided into two groups. Group I consisted of patients with KC, who received optimized femtosecond laser-assisted MyoRing implantation, group II - of those, who received femtosecond laser-assisted ICS implantation...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28742618/changes-in-higher-order-aberrations-after-phototherapeutic-keratectomy-for-subepithelial-corneal-infiltrates-after-epidemic-keratoconjunctivitis
#9
Burcin Kepez Yildiz, Semih Urvasizoglu, Yusuf Yildirim, Alper Agca, Nilay K Besek, Korhan Fazil, Erdem Eris, Ebru Demet Aygit, Muhittin Taskapili, Ahmet Demirok
PURPOSE: To investigate how corneal aberrations change after phototherapeutic keratectomy (PTK) for subepithelial infiltrates after adenoviral keratoconjunctivitis. METHODS: The records of patients who underwent transepithelial PTK for subepithelial infiltrates were retrospectively reviewed. Preoperative best-corrected visual acuity (VA) and the results of slit-lamp biomicroscopy examinations were recorded. The PTK procedure was performed under topical anesthesia with an Amaris excimer laser...
July 24, 2017: Cornea
https://www.readbyqxmd.com/read/28736663/three-dimensional-oct-based-guinea-pig-eye-model-relating-morphology-and-optics
#10
Pablo Pérez-Merino, Miriam Velasco-Ocana, Eduardo Martinez-Enriquez, Luis Revuelta, Sally A McFadden, Susana Marcos
Custom Spectral Optical Coherence Tomography (SOCT) provided with automatic quantification and distortion correction algorithms was used to measure the 3-D morphology in guinea pig eyes (n = 8, 30 days; n = 5, 40 days). Animals were measured awake in vivo under cyclopegia. Measurements showed low intraocular variability (<4% in corneal and anterior lens radii and <8% in the posterior lens radii, <1% interocular distances). The repeatability of the surface elevation was less than 2 µm. Surface astigmatism was the individual dominant term in all surfaces...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28736660/effect-of-higher-order-aberrations-and-intraocular-scatter-on-contrast-sensitivity-measured-with-a-single-instrument
#11
Junlei Zhao, Fei Xiao, Haoxin Zhao, Yun Dai, Yudong Zhang
Higher-order aberrations (HOAs) and intraocular scatter lead to the degradation of image quality on the retina, and consequently deteriorate subjective visual performance. In this article, we modified an adaptive optics double-pass system to combine objective and subjective visual testing capabilities. Employing the modified DP system, we investigated the effects of HOAs and intraocular scatter on contrast sensitivity. Contrast sensitivity measurements were performed with HOAs either retained or corrected by adaptive optics, and with scatter either remaining at the natural eye-induced level or further enhanced by a set of three different scatter filters...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28736657/high-temporal-resolution-aberrometry-in-a-50-eye-population-and-implications-for-adaptive-optics-error-budget
#12
Jessica Jarosz, Pedro Mecê, Jean-Marc Conan, Cyril Petit, Michel Paques, Serge Meimon
We formed a database gathering the wavefront aberrations of 50 healthy eyes measured with an original custom-built Shack-Hartmann aberrometer at a temporal frequency of 236 Hz, with 22 lenslets across a 7-mm diameter pupil, for a duration of 20 s. With this database, we draw statistics on the spatial and temporal behavior of the dynamic aberrations of the eye. Dynamic aberrations were studied on a 5-mm diameter pupil and on a 3.4 s sequence between blinks. We noted that, on average, temporal wavefront variance exhibits a n(-2) power-law with radial order n and temporal spectra follow a f(-1...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28732606/visual-performance-after-bilateral-implantation-of-2-new-presbyopia-correcting-intraocular-lenses-trifocal-versus-extended-range-of-vision
#13
Gaspare Monaco, Mariangela Gari, Fabio Di Censo, Andrea Poscia, Giada Ruggi, Antonio Scialdone
PURPOSE: To compare the visual outcomes and quality of vision of 2 new diffractive multifocal intraocular lenses (IOLs) with those of a monofocal IOL. SETTING: Fatebenefratelli e Oftalmico Hospital, Milan, Italy. DESIGN: Prospective case series. METHODS: Patients had bilateral cataract surgery with implantation of a trifocal IOL (Panoptix), an extended-range-of-vision IOL (Symfony), or a monofocal IOL (SN60WF). Postoperative examinations included assessing distance, intermediate, and near visual acuity; binocular defocus; intraocular and total aberrations; point-spread function (PSF); modulation transfer function (MTF); retinal straylight; and quality-of-vision (QoV) and spectacle-dependence questionnaires...
June 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28727613/aberrometry-repeatability-and-agreement-with-autorefraction
#14
Mylan T Nguyen, David A Berntsen
SIGNIFICANCE: Commercially available aberrometers are essential to clinical studies evaluating refractive error and image quality. The Discovery System (Innovative Visual Systems, Elmhurst, IL) is a promising clinical instrument that allows investigators to export aberration data for research and analysis purposes. An assessment of the Discovery System's performance is essential to the interpretation of the data obtained. PURPOSE: The aims of this study were to determine the between-visit repeatability of refractive error and higher-order aberration measurements with the Discovery System and to examine between-instrument agreement of refractive error measurements with the Discovery System and Grand Seiko WAM-5500 open-field autorefractor (Grand Seiko Co...
July 19, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28724823/topography-guided-neutralization-technique-for-the-management-of-flap-complication-in-laser-in-situ-keratomileusis
#15
Rohit Shetty, Rushad Shroff, Tushar Grover, T Roshan, Chaitra Jayadev
A 29-year-old male was referred following a flap loss after the creation of a thin, irregular flap with a visual acuity of logMAR 0.1 with -2.0 DS-2.75 DC × 175°. Corneal topography and anterior segment optical coherence tomography revealed an irregular corneal curvature and epithelial profile. Phototherapeutic keratectomy (PTK) followed by Topography - Guided Custom Ablation Treatment (TCAT), as a modification of the topographic neutralization technique protocol, was planned to regularize the corneal surface and treat the residual refractive error...
July 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28724780/a-reduced-somatosensory-gating-response-in-individuals-with-multiple-sclerosis-is-related-to-walking-impairment
#16
David J Arpin, James E Gehringer, Tony W Wilson, Max J Kurz
When identical stimuli are presented in rapid temporal succession, neural responses to the second stimulation are often weaker than that observed for the first. This phenomenon is termed sensory gating and is believed to be an adaptive feature that helps prevent higher-order cortical centers from being flooded with unnecessary information. Recently, sensory gating in the somatosensory system has been linked to deficits in tactile discrimination. Additionally, studies have linked poor tactile discrimination with impaired walking and balance in individuals with multiple sclerosis (MS)...
July 19, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28716111/quantitation-of-dna-methylation-in-epstein-barr-virus-associated-nasopharyngeal-carcinoma-by-bisulfite-amplicon-sequencing
#17
Weilin Zhao, Yingxi Mo, Shumin Wang, Kaoru Midorikawa, Ning Ma, Yusuke Hiraku, Shinji Oikawa, Guangwu Huang, Zhe Zhang, Mariko Murata, Kazuhiko Takeuchi
BACKGROUND: Epigenetic changes, including DNA methylation, disrupt normal cell function, thus contributing to multiple steps of carcinogenesis. Nasopharyngeal carcinoma (NPC) is endemic in southern China and is highly associated with Epstein-Barr virus (EBV) infection. Significant changes of the host cell methylome are observed in EBV-associated NPC with cancer development. Epigenetic marks for NPC diagnosis are urgently needed. In order to explore DNA methylation marks, we investigated DNA methylation of candidate genes in EBV-associated nasopharyngeal carcinoma...
July 17, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28700139/oct-layered-tomography-of-the-cornea-provides-new-insights-on-remodeling-after-photorefractive-keratectomy
#18
Rachana S Chandapura, Rohit Shetty, Rushad Shroff, Neha Shilpy, Mathew Francis, Abhijit Sinha Roy
OCT topography of corneal layers was generated to analyze the remodeling of the epithelium and stroma after photorefractive keratectomy (PRK). Myopic PRK was performed in 15 patients. One eye underwent manual scraping of epithelium while the other was treated with Epi clear™. Epi clear allowed a gentler removal of the epithelium compared to manual scraping. Scheimpflug (Pentacam™, OCULUS Optikgerate Gmbh, Germany) and OCT (RTVue™, Optovue Inc., USA) scan of the cornea was performed before and after PRK (3 months)...
July 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28696504/association-of-mycn-copy-number-with-clinical-features-tumor-biology-and-outcomes-in-neuroblastoma-a-report-from-the-children-s-oncology-group
#19
Kevin Campbell, Julie M Gastier-Foster, Meegan Mann, Arlene H Naranjo, Collin Van Ryn, Rochelle Bagatell, Katherine K Matthay, Wendy B London, Meredith S Irwin, Hiroyuki Shimada, M Meaghan Granger, Michael D Hogarty, Julie R Park, Steven G DuBois
BACKGROUND: High-level MYCN amplification (MNA) is associated with poor outcome and unfavorable clinical and biological features in patients with neuroblastoma. To the authors' knowledge, less is known regarding these associations in patients with low-level MYCN copy number increases. METHODS: In this retrospective study, the authors classified patients has having tumors with MYCN wild-type tumors, MYCN gain (2-4-fold increase in MYCN signal compared with the reference probe), or MNA (>4-fold increase)...
July 11, 2017: Cancer
https://www.readbyqxmd.com/read/28683793/comparison-of-visual-results-and-higher-order-aberrations-after-small-incision-lenticule-extraction-smile-high-myopia-vs-mild-to-moderate-myopia
#20
Hong-Ying Jin, Ting Wan, Fang Wu, Ke Yao
BACKGROUND: To compare the refractive results and higher-order aberrations (HOAs) after small incision lenticule extraction (SMILE) in high myopia and mild to moderate myopia patients. METHODS: This prospective study included 165 eyes (86 patients) undergoing SMILE. According to the preoperative spherical equivalent (SE), treated eyes were divided into two groups: the high myopia group (more than -6.0 D, group-H) and the mild to moderate group (less than -6.0 D, group-M)...
July 6, 2017: BMC Ophthalmology
keyword
keyword
104440
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"