Read by QxMD icon Read


Xiangchuan Meng, Xiaotian Hu, Xia Yang, Jingping Yin, Qingxia Wang, Liqiang Huang, Zoukangning Yu, Ting Hu, Licheng Tan, Weihua Zhou, Yiwang Chen
Flexible transparent electrodes (FTEs) are an indispensable component for flexible optoelectronic devices. In this work, the meter-scale composite transparent electrode (CTEs) composing of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and Ag-grid/PET with optimized mechanical and optical properties is demonstrated by slot-die roll-to-roll technique with solution printing method under a low cost (2.8 $ for per square meter), via control of the viscosity and surface energy of PEDOT:PSS ink as well as the printing parameters...
February 19, 2018: ACS Applied Materials & Interfaces
Ahmed N Sedky, Sherine S Wahba, Maged M Roshdy, Nermeen R Ayaad
BACKGROUND: Different enhancement procedures have been suggested for reduction of residual refractive errors after SMILE. The aim of this study is to evaluate an improved cap-preserving technique for enhancement after SMILE (Re-SMILE). METHODS: A retrospective case series was conducted at Eye subspecialty center, Cairo, Egypt on 9 eyes with myopia or myopic astigmatism (spherical equivalent - 8.0 and - 12.0D). undergoing SMILE procedure and needed second interference...
February 17, 2018: BMC Ophthalmology
Alexander C Day, David Cooper, Jennifer Burr, Paul J Foster, David S Friedman, Gus Gazzard, Jemaima Che-Hamzah, Tin Aung, Craig R Ramsay, Augusto Azuara-Blanco
BACKGROUND: To describe the surgical technique and refractive outcomes following clear lens extraction (CLE) in the Effectiveness, in Angle-closure Glaucoma, of Lens Extraction trial. METHODS: Review of prospectively collected data from a multicentre, randomised controlled trial comparing CLE and laser peripheral iridotomy. Eligible participants were ≥50 years old and newly diagnosed with (1) primary angle closure (PAC) with intraocular pressure above 30 mm Hg or (2) PAC glaucoma...
February 16, 2018: British Journal of Ophthalmology
Yo Iwata, Tomoya Handa, Hitoshi Ishikawa, Toshiaki Goseki, Nobuyuki Shoji
PURPOSE: In recent years, amblyopia treatment device that can be used with both eyes open have been reported. The Occlu-pad is a device that can present images of tablet terminals to one eye only under binocular open conditions. Till date, no study has reported the effectiveness of Occlu-pad training for anisometropic amblyopia in a series of cases. In the present study, we evaluated the effectiveness of the Occlu-pad for the management of anisometropic amblyopia without the use of occlusion therapy (eyepatch)...
February 16, 2018: Current Eye Research
Mingue Kim, Youngsub Eom, Hwa Lee, Young-Woo Suh, Jong Suk Song, Hyo Myung Kim
Purpose: To evaluate the accuracy of IOL power calculation using adjusted corneal power according to the posterior/anterior corneal curvature radii ratio. Methods: Nine hundred twenty-eight eyes from 928 reference subjects and 158 eyes from 158 cataract patients who underwent phacoemulsification surgery were enrolled. Adjusted corneal power of cataract patients was calculated using the fictitious refractive index that was obtained from the geometric mean posterior/anterior corneal curvature radii ratio of reference subjects and adjusted anterior and predicted posterior corneal curvature radii from conventional keratometry (K) using the posterior/anterior corneal curvature radii ratio...
February 1, 2018: Investigative Ophthalmology & Visual Science
Daniela Adriana Iliescu, Cristina Mihaela Timaru, Nicolae Alexe, Elena Gosav, Algerino De Simone, Mehdi Batras, Cornel Stefan
Diplopia (seeing double) is an ophthalmologic complaint found mainly in elder patients. It can have both ocular and neurological causes. A careful history and clinical examination must detail the type of diplopia (monocular/ binocular), onset, and progression, associated and relieving factors. In case of monocular diplopia, refraction and biomicroscopic examination of the ocular media are mandatory. The cause of ocular misalignment for binocular diplopia must be determined and life-threatening conditions (such as posterior communicating artery aneurysm) must imply an immediate treatment...
July 2017: Romanian Journal of Ophthalmology
Camelia Margareta Bogdănici, Diana Elena Săndulache, Corina Andreea Nechita
The aim of the study was to analyze the effects that gadgets have on eyesight quality. A prospective observational study was conducted from January to July 2016, on 60 people who were divided into two groups: Group 1 - 30 middle school pupils with a mean age of 11.9 ± 1.86 and Group 2 - 30 patients evaluated in the Ophthalmology Clinic, "Sf. Spiridon" Hospital, Iași, with a mean age of 21.36 ± 7.16 years. The clinical parameters observed were the following: visual acuity (VA), objective refraction, binocular vision (BV), fusional amplitude (FA), Schirmer's test...
April 2017: Romanian Journal of Ophthalmology
Filip Mircea
No abstract text is available yet for this article.
April 2017: Romanian Journal of Ophthalmology
KyeoReh Lee, Youngmin Kim, JaeHwang Jung, Hyotcherl Ihee, YongKeun Park
A novel optical holographic technique is presented to simultaneously measure both the real and imaginary components of the complex refractive index (CRI) of a protein solution over a wide visible wavelength range. Quantitative phase imaging was employed to precisely measure the optical field transmitted from a protein solution, from which the CRIs of the protein solution were retrieved using the Fourier light scattering technique. Using this method, we characterized the CRIs of the two dominant structural states of a photoactive yellow protein solution over a broad wavelength range (461-582 nm)...
February 15, 2018: Scientific Reports
Abiy Maru Alemayehu, Gizchewu Tilahun Belete, Nebiyat Feleke Adimassu
INTRODUCTION: Refractive error is an important cause of correctable visual impairment in the worldwide with a global distribution of 1.75% to 20.7% among schoolchildren. Teacher's knowledge about refractive error play an important role in encouraging students to seek treatment that helps in reducing the burden of visual impairment. OBJECTIVE: To determine knowledge, attitude and associated factors among primary school teachers regarding refractive error in school children in Gondar city...
2018: PloS One
Hui Pan, Zhixin Chen, Shenmin Zhu, Chun Jiang, Di Zhang
Nanoparticles having the ability to self-assemble into order structure in their suspensions analogous to liquid crystals, have attracted extensive attention. Herein, we report a new type of colloidal gel with ordered crystal structure assembled from 1D and 2D nanoparticles. The materials has high elasticity, and more interestingly it shows significant photoelasticity. Its refractive index can be tuned under external stress and exhibits an ultra-wide dynamic range (Δ<i>n</i>), in the order of 10<sup>-2</sup>...
February 15, 2018: Nanotechnology
Jennifer R Evans, Priya Morjaria, Christine Powell
BACKGROUND: Although the benefits of vision screening seem intuitive, the value of such programmes in junior and senior schools has been questioned. In addition there exists a lack of clarity regarding the optimum age for screening and frequency at which to carry out screening. OBJECTIVES: To evaluate the effectiveness of vision screening programmes carried out in schools to reduce the prevalence of correctable visual acuity deficits due to refractive error in school-age children...
February 15, 2018: Cochrane Database of Systematic Reviews
Samuel Arba Mosquera, Diego de Ortueta, Shwetabh Verma
Background: In this retrospective randomized case series, we compared bilateral symmetry between OD and OS eyes, intercorneal differences and Functional Optical Zone (FOZ) of the corneal aberrations. Methods: Sixty-seven normal subjects (with no ocular pathology) who never had any ocular surgery were bilaterally evaluated at Augenzentrum Recklinghausen (Germany). In all cases, standard examinations and corneal wavefront topography (OPTIKON Scout) were performed...
2018: Eye and Vision (London, England)
Xiaotong Han, Tangjian Yang, Jian Zhang, Sha Yu, Xinxing Guo, William Yan, Yin Hu, Mingguang He
OBJECTIVES: To investigate the longitudinal changes in intraocular pressure (IOP) and its associations with refractive error and systemic determinants in a Chinese geriatric population. DESIGN: Prospective cohort study. SETTING: Guangzhou Government Servant Physical Check-up Center, Guangzhou, China. PARTICIPANTS: 4413 government employees aged no less than 40 years (41.9% female) attending annual physical and eye examinations were included in this study...
February 14, 2018: BMJ Open
Kaiwei Li, Nan Zhang, Nancy Meng Ying Zhang, Guigen Liu, Ting Zhang, Lei Wei
We report an ultrasensitive gas refractive index (RI) sensor based on optical nanofiber couplers (ONCs). Theoretical analysis reveals that a dispersion turning point (DTP) exists when the diameter of the coupler is below 1000 nm. Leveraging this DTP, the gas RI sensitivity can be significantly improved to infinity. Then we experimentally demonstrate a DTP and achieve ultrahigh sensitivities of 46,470  nm/refractive index unit (RIU) and -45,550  nm/RIU around the DTP using an ONC with a diameter of 700 nm...
February 15, 2018: Optics Letters
Qianru Yang, Linling Qin, Guoyang Cao, Cheng Zhang, Xiaofeng Li
We propose a graphene-coated photonic system with the excitation of Bloch surface waves (BSWs) for refractive index sensing. Through manipulation of the BSW resonance in the truncated photonic crystal under a Kretschmann configuration, the absorption in a graphene monolayer is significantly enhanced, assisted by the strong electromagnetic confinement of BSWs. The sharp and low reflectivity dip and the strong wave-environment interaction enable highly sensitive optical sensing. First-order perturbation theory and transfer-matrix calculation indicate that the system sensitivity is strongly related to the ratio of the electric field energy in the detection area, operation wavelength, and incident angle...
February 15, 2018: Optics Letters
Risto Montonen, Ivan Kassamakov, Peter Lehmann, Kenneth Österberg, Edward Hæggström
The group refractive index is important in length calibration of Fourier domain interferometers by transparent transfer standards. We demonstrate accurate group refractive index quantification using a Fourier domain short coherence Sagnac interferometer. Because of a justified linear length calibration function, the calibration constants cancel out in the evaluation of the group refractive index, which is then obtained accurately from two uncalibrated lengths. Measurements of two standard thickness coverslips revealed group indices of 1...
February 15, 2018: Optics Letters
Christopher Holmes, Alexander Jantzen, Alan C Gray, Paul C Gow, Lewis G Carpenter, Rex H S Bannerman, James C Gates, Peter G R Smith
This Letter demonstrates a refractometer in integrated optical fiber, a new optical platform that planarizes fiber using flame hydrolysis deposition (FHD). The unique advantage of the technology is survivability in harsh environments. The platform is mechanically robust, and can survive elevated temperatures approaching 1000°C and exposure to common solvents, including acetone, gasoline, and methanol. For the demonstrated refractometer, fabrication was achieved through wet etching an SMF-28 fiber to a diameter of 8 μm before FHD planarization...
February 15, 2018: Optics Letters
Jorge Mendez Astudillo, Lawrence Lau, Yu-Ting Tang, Terry Moore
As Global Navigation Satellite System (GNSS) signals travel through the troposphere, a tropospheric delay occurs due to a change in the refractive index of the medium. The Precise Point Positioning (PPP) technique can achieve centimeter/millimeter positioning accuracy with only one GNSS receiver. The Zenith Tropospheric Delay (ZTD) is estimated alongside with the position unknowns in PPP. Estimated ZTD can be very useful for meteorological applications, an example is the estimation of water vapor content in the atmosphere from the estimated ZTD...
February 14, 2018: Sensors
Bhupender Pal, Soumya Suddha Mallick, Bonamali Pal
The long term dispersion stability for an improved thermal conductivity is a challenging issue that needs to be solved for heat transfer applications. Hence, this research investigated that a thin layer of SiO2 coating (2-5 nm) over WO3 nanostructures (SiO2@WO3) of different shapes exhibit superior dispersion (0.01%) stability for longer duration (∼3 days) as evident by steady zeta potential (-30 ↔ -60.70 mV), no significant change in particle-size (139 ↔ 147 nm) distribution, density (1.001 ↔ 0.988 g/cm3) and refractive index (1...
May 1, 2018: Journal of Nanoscience and Nanotechnology
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"