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https://www.readbyqxmd.com/read/28328814/clinical-outcomes-of-new-toric-trifocal-diffractive-intraocular-lens-in-patients-with-cataract-and-stable-keratoconus-six-months-follow-up
#1
Doroodgar Farideh, Sanginabadi Azad, Niazi Feizollah, Niazi Sana, Alinia Cyrus, Ghoreishi Mohammad, Baradaran-Rafii Alireza
PURPOSE: To evaluate the clinical results of toric trifocal diffractive intraocular lens in eyes with cataract and mild keratoconus. METHODS: Five keratoconus patients (10 eyes) that had bilateral AT LISA 939 implantation were selected and had followed in 3-time horizons of 1, 3, and 6 months. Patients were 46 to 65 years old age, corneal astigmatism of (2.00 D at 6.75 D) and cataract that all of them needed cataract surgery. The distance, intermediate and near visual acuities, defocus curve, ocular aberrations, contrast sensitivity, were measured as effectiveness criteria...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28327553/choroidal-thickness-in-3001-chinese-children-aged-6-to-19-years-using-swept-source-oct
#2
Shuyu Xiong, Xiangui He, Junjie Deng, Minzhi Lv, Jiali Jin, Sifei Sun, Chunxia Yao, Jianfeng Zhu, Haidong Zou, Xun Xu
The purpose of the cross-sectional study is to describe the values and distribution of choroidal thickness and to explore its related factors, especially age, in Chinese children. A total of 3001 Chinese school children aged 6 to 19 years underwent comprehensive ophthalmic examinations, including axial length and cycloplegic refraction. Choroidal thickness was measured by swept-source optical coherence tomography (SS-OCT). There was a greater difference in the more central regions between the myopes and emmetropes...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28326607/effect-of-apparent-depth-cues-on-accommodation-in-a-badal-optometer
#3
Carles Otero, Mikel Aldaba, Beatriz Martínez-Navarro, Jaume Pujol
BACKGROUND: The aim was to analyse the effect of peripheral depth cues on accommodation in Badal optometers. METHODS: Monocular refractions at 0.17 and 5.00 D of accommodative stimulus were measured with the PowerRef II autorefractor (Plusoptix Inc., Atlanta, Georgia, USA). Subjects looked (randomly) at four different scenes, one real scene comprising familiar objects at different depth planes (Real) and three virtual scenes comprising different two-dimensional pictures seen through a Badal lens...
March 21, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28326601/quantitative-analysis-of-eyes-and-other-optical-systems-in-linear-optics
#4
William F Harris, Tanya Evans, Radboud D van Gool
PURPOSE: To show that 14-dimensional spaces of augmented point P and angle Q characteristics, matrices obtained from the ray transference, are suitable for quantitative analysis although only the latter define an inner-product space and only on it can one define distances and angles. The paper examines the nature of the spaces and their relationships to other spaces including symmetric dioptric power space. METHODS: The paper makes use of linear optics, a three-dimensional generalization of Gaussian optics...
March 21, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28323100/reflectometric-monitoring-of-the-dissolution-process-of-thin-polymeric-films
#5
Riikka Laitinen, Jukka Räty, Kristiina Korhonen, Jarkko Ketolainen, Kai-Erik Peiponen
Pharmaceutical thin films are versatile drug-delivery platforms i.e. allowing transdermal, oral, sublingual and buccal administration. However, dissolution testing of thin films is challenging since the commonly used dissolution tests for conventional dosage forms correspond rather poorly to the physiological conditions at the site of administration. Here we introduce a traditional optical reflection method for monitoring the dissolution behavior of thin polymeric films. The substances, e.g. drug molecules, released from the film generate an increase in the refractive index in the liquid medium which can be detected by reflectance monitoring...
March 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28322948/development-of-curcumin-loaded-chitosan-polymer-based-nanoemulsion-gel-in-vitro-ex-vivo-evaluation-and-in-vivo-wound-healing-studies
#6
Lydia Thomas, Foziyah Zakira, Mohd Aamir Mirza, Md Khalid Anwer, Farhan Jalees Ahmad, Zeenat Iqbal
In the present study, various nanoemulsions were prepared using Labrafac PG+Triacetin as oil, Tween 80 as a surfactant and polyethylene glycol (PEG 400) as a co-surfactant. The developed nanoemulsions (NE1-NE5) were evaluated for physicochemical characterizations and ex-vivo for skin permeation and deposition studies. The highest skin deposition was observed for NE2 with 46.07% deposition amongst all developed nanoemulsions (NE1-NE5). Optimized nanoemulsion (NE2) had vesicle size of 84.032±0.023nm, viscosity 78...
March 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28322149/characterization-of-polysaccharides-from-the-fruiting-bodies-of-two-species-of-genus-ganoderma-agaricomycetes-and-determination-of-water-soluble-%C3%AE-d-glucan-using-high-performance-liquid-chromatography
#7
Yanfang Liu, Qingjiu Tang, Yan Yang, Shuai Zhou, Di Wu, Chuanhong Tang, Zhong Zhang, Mengqiu Yan, Jie Feng, Jing-Song Zhang
Molecular weight (Mw) distributions of polysaccharides from the fruiting bodies of different Ganoderma lucidum strains and G. sinense were investigated and compared using high-pressure size exclusion chromatography/multiangle laser light scattering/refractive index analysis. Results showed that there were big differences in the Mw distributions and characteristics of polysaccharides from 2 species of Ganoderma. All tested G. lucidum materials exhibited similar polysaccharide distributions and similar characteristics for each fraction...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/28319899/molecular-imprinting-sensor-based-on-quantum-weak-measurement
#8
Dongmei Li, Qinghua He, Yonghong He, Meiguo Xin, Yilong Zhang, Zhiyuan Shen
A new type of sensing protocol, based on a high precision metrology of quantum weak measurement, was first proposed for molecularly imprinted polymers (MIP) sensor. The feasibility, sensitivity and selectivity of weak measurement based MIP (WMMIP) sensor were experimentally demonstrated with bovine serum albumin (BSA). Weak measurement system exhibits high sensitivity to the optical phase shift corresponding to the refractive index change, which is induced by the specific capture of target protein molecules with its recognition sites...
March 10, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28318725/-comparison-of-refraction-with-or-without-cycloplegia-using-retinomax-%C3%A2-or-plusoptix-%C3%A2-devices
#9
E Bui Quoc, S Guilmin Crepon, S Tinguely, G Lavallee, G Busquet, M Angot, L Vera
PURPOSE: To evaluate the refraction in children measured with Plusoptix(®) without cycloplegia vs. Retinomax(®) apparatus with cycloplegia. PATIENTS AND METHODS: Measure of refraction with Plusoptix(®) in children>1year old referred for systematic vision screening, then measurement after cycloplegia with cyclopentolate by the Retinomax(®) device. RESULTS: Thirty-three children were included, i.e. 66eyes. Mean age was 40.7months (minimum 12; maximum 114)...
March 16, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28318639/enhancement-after-small-incision-lenticule-extraction-incidence-risk-factors-and-outcomes
#10
Yu-Chi Liu, Mohamad Rosman, Jodhbir S Mehta
PURPOSE: To report the incidence, risk factors, and outcomes of enhancement after small-incision lenticule extraction (SMILE). DESIGN: Retrospective cohort study. PARTICIPANTS: Five hundred twenty-four eyes of 307 patients who underwent SMILE at Singapore National Eye Center between February 2012 and March 2016. METHODS: The data collected included patient age at primary SMILE, gender, race, preoperative and postoperative manifest refraction spherical equivalent (MRSE), preoperative and postoperative uncorrected distance visual acuity and corrected distance visual acuity, the occurrence of suction loss during the procedure, and the need for enhancement...
March 15, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28317927/observation-of-acoustic-dirac-like-cone-and-double-zero-refractive-index
#11
Marc Dubois, Chengzhi Shi, Xuefeng Zhu, Yuan Wang, Xiang Zhang
Zero index materials where sound propagates without phase variation, holds a great potential for wavefront and dispersion engineering. Recently explored electromagnetic double zero index metamaterials consist of periodic scatterers whose refractive index is significantly larger than that of the surrounding medium. This requirement is fundamentally challenging for airborne acoustics because the sound speed (inversely proportional to the refractive index) in air is among the slowest. Here, we report the first experimental realization of an impedance matched acoustic double zero refractive index metamaterial induced by a Dirac-like cone at the Brillouin zone centre...
March 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28317861/hydatid-detection-using-the-near-infrared-transmission-angular-spectra-of-porous-silicon-microcavity-biosensors
#12
Peng Li, Zhenhong Jia, Guodong Lü
Hydatid, which is a parasitic disease, occurs today in many regions worldwide. Because it can present a serious threat to people's health, finding a fast, convenient, and economical means of detection is important. This paper proposes a label- and spectrophotometer-free apparatus that uses optical biological detection based on porous silicon microcavities. In this approach, the refractive index change induced by the biological reactions of a sample in a porous silicon microcavity is detected by measuring the change in the incidence angle corresponding to the maximum transmitted intensity of a near-infrared probe laser...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317740/physicochemical-and-thermal-characteristics-of-australian-chia-seed-oil
#13
Yakindra Prasad Timilsena, Jitraporn Vongsvivut, Raju Adhikari, Benu Adhikari
Physicochemical and thermal characteristics of Australian chia seed oil (CSO) were studied. The specific gravity, viscosity and refractive index of CSO at ambient temperature were 0.93, 43.2mPa.s and 1.48, respectively. The acid, peroxide, saponification and iodine values and unsaponifiable matter content of CSO were 2.54gKOH/kg oil, 4.33meqO2/kg oil, 197gKOH/kg oil, 204gI2/kg oil and 1.12%, respectively. α-linolenic acid is the most abundant fatty acid comprising (64.39% of total oil) followed by linoleic acid (21...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28317678/quality-of-vision-after-wavefront-guided-laser-in-situ-keratomileusis-or-photorefractive-keratectomy-contralateral-eye-evaluation
#14
Michele D Lee, Edward E Manche
PURPOSE: To compare quality of vision between laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK). SETTING: Byers Eye Institute, Stanford University School of Medicine, Palo Alto, California, USA. DESIGN: Prospective randomized case series. METHODS: Patients had refractive surgery, with 1 eye treated with LASIK and the other with PRK. Eyes were randomized for dominance. The patients completed a questionnaire assessing quality of vision in each eye at the initial visit and 1, 3, 6, and 12 months postoperatively...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28317667/small-incision-lenticule-extraction-in-a-patient-with-congenital-nystagmus
#15
Bu Ki Kim, Su Joung Mun, Dae Gyu Lee, Hyun Tae Choi, Young Taek Chung
We report a case of a 23-year-old woman with congenital nystagmus who had small-incision lenticule extraction (SMILE) procedure to correct refractive errors. The manifest refraction was -5.50 -1.75 × 180 in the right eye, -5.0 -2.50 × 180 in the left eye, and the patient presented with horizontal pendular nystagmus with an amplitude range of 5 to 10 degrees. Uneventful simultaneous bilateral small-incision lenticule extraction was performed. Six months postoperatively, the uncorrected distance visual acuity was 20/18 with -0...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28317664/posterior-chamber-phakic-intraocular-lenses-to-improve-visual-outcomes-in-keratoconus-patients
#16
REVIEW
José Juan Esteve-Taboada, Alberto Domínguez-Vicent, Teresa Ferrer-Blasco, José F Alfonso, Robert Montés-Micó
The aim of this review is to summarize the results of using posterior chamber phakic intraocular lenses (pIOLs) to restore quality of vision in keratoconus patients. These pIOLs can correct the refractive errors associated with keratoconus and can also be combined with other surgical techniques to improve the results.
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28315834/risk-factors-for-myopia-progression-in-second-grade-primary-school-children-in-taipei-a-population-based-cohort-study
#17
Chih-Chien Hsu, Nicole Huang, Pei-Yu Lin, Shao-You Fang, Der-Chong Tsai, Shing-Yi Chen, Ching-Yao Tsai, Lin-Chung Woung, Shih-Hwa Chiou, Catherine Jui-Ling Liu
PURPOSE: To evaluate the 1-year progression of myopia and associated risk factors in second-grade primary school children. METHODS: The myopia investigation study in Taipei provided semiannual visual acuity testing and cycloplegic refraction for all second-grade primary school children (mean age: 7.49 years) in Taipei who provided parental consent. A questionnaire was distributed to the participants' parents before the first and third examinations. We evaluated 1-year follow-up data for children noted to have myopia on the first examination...
March 18, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28314749/optical-influence-of-oil-droplets-on-cone-photoreceptor-sensitivity
#18
David Wilby, Nicholas W Roberts
Oil droplets are spherical organelles found in the cone photoreceptors of vertebrates. They are generally assumed to focus incident light into the outer segment, and thereby improve light catch because of the droplets' spherical lens-like shape. However, using full-wave optical simulations of physiologically realistic cone photoreceptors from birds, frogs and turtles we find that pigmented oil droplets actually drastically reduce the transmission of light into the outer segment integrated across the full visible wavelength range of each species...
March 17, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28304386/effect-of-pregnancy-in-myopia-progression-the-sun-cohort
#19
A Fernández-Montero, M Bes-Rastrollo, J Moreno-Montañés, L Moreno-Galarraga, M Á Martínez-González
PurposePrevious studies have suggested that pregnancy may induce myopia progression. However, no longitudinal study with a large sample size and long-term follow-up has assessed this association. Our objective was to investigate whether pregnancy was related to mid- or long-term myopic refraction changes.Patients and methodsA prospective study was conducted in a Mediterranean cohort. The study included 10 401 women (20-50 years old) from the SUN Project. SUN project is a multipurpose, prospective, and dynamic cohort of university graduates conducted in Spain...
March 17, 2017: Eye
https://www.readbyqxmd.com/read/28304244/intravitreally-administered-dopamine-d2-like-and-d4-but-not-d1-like-receptor-agonists-reduce-form-deprivation-myopia-in-tree-shrews
#20
Alexander H Ward, John T Siegwart, Michael R Frost, Thomas T Norton
We examined the effect of intravitreal injections of D1-like and D2-like dopamine receptor agonists and antagonists and D4 receptor drugs on form-deprivation myopia (FDM) in tree shrews, mammals closely related to primates. In eleven groups (n = 7 per group), we measured the amount of FDM produced by monocular form deprivation (FD) over an 11-day treatment period. The untreated fellow eye served as a control. Animals also received daily 5 µL intravitreal injections in the FD eye. The reference group received 0...
January 2017: Visual Neuroscience
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