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https://www.readbyqxmd.com/read/28346278/effects-of-myopic-orthokeratology-on-visual-performance-and-optical-quality
#1
Guihua Liu, Zhi Chen, Feng Xue, Jing Li, Mi Tian, Xingtao Zhou, Ruihua Wei
OBJECTIVES: To analyze the changes in visual performance and optical quality after orthokeratology (ortho-k) treatment and its correlation with the magnitude of lens decentration and the diameter of treatment zone (TxZ). METHODS: A prospective study was conducted in 27 eyes of 27 patients wearing ortho-k contact lens. Area under log contrast sensitivity function (AULCSF), modulation transfer function cutoff values (MTFcutoff), Strehl ratio (SR), and objective scattering index (OSI) were measured and compared before and 1 month after ortho-k lens treatment...
March 24, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28343751/presbyopic-and-non-presbyopic-contact-lens-opinions-and-vision-correction-preferences
#2
Erin M Rueff, Melissa D Bailey
PURPOSE: To compare vision correction preferences, refractive error, and gender of non-presbyopes and presbyopes. METHODS: Adults who wear spectacles or contact lenses completed a survey about refractive correction opinions and refractive error was measured. RESULTS: Of the 304 subjects, 38.2% were presbyopic (≥40 years) and 59.2% were female. Spectacles were the primary vision correction for 78.0% of subjects. Compared to contact lens wearers, the proportion of presbyopes was higher (p=0...
March 23, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28339301/cultivation-of-human-oral-mucosal-explants-on-contact-lenses
#3
Barbara Zsebik, László Ujlaky-Nagy, Gergely Losonczy, György Vereb, Lili Takács
Purpose/Aim: Autologous cultivated oral mucosal (OM) epithelial transplantation has been successfully used as corneal epithelial replacement in bilateral limbal stem cell deficiency. Recently, lotrafilcon A contact lens (CL) surface was described as a suitable carrier for cultured stem cells in corneal epithelial transplantation. Our aim was to establish explant cultures from human OM on CL carriers that are free of animal-derived materials and feeder cells. MATERIALS AND METHODS: Human cadaveric 2 mm OM explants were sutured onto CL surfaces and cultivated with fetal calf serum (FCS) or human serum (HS) supplemented culture medium without feeder cells...
March 24, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28338565/corneal-nerve-morphology-sensitivity-and-tear-neuropeptides-in-contact-lens-wear
#4
Blanka Golebiowski, Cecilia Chao, Fiona Stapleton, Isabelle Jalbert
PURPOSE: To determine tear neuropeptide levels in contact lens wearers and non-wearers, and to examine relationships with indices of corneal innervation, tear function, and ocular discomfort. METHODS: A cross-sectional, single-visit, investigator-masked pilot study. Assessments included Ocular Comfort Index (OCI), central and mid-peripheral corneal nerve density and morphology (HRT-Rostock), corneal sensitivity (Cochet-Bonnet aesthesiometer), tear Substance P and calcitonin gene-related peptide (CGRP) concentration (ELISA), in situ tear osmolarity (TearLab), tear secretion (Phenol Red Thread), and noninvasive tear break-up time (NITBUT; Keeler Tearscope)...
April 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28336675/evolving-risk-factors-and-antibiotic-sensitivity-patterns-for-microbial-keratitis-at-a-large-county-hospital
#5
Haoxing Jin, Walter T Parker, Nathan W Law, Cameron L Clarke, Jordan D Gisseman, Stephen C Pflugfelder, Li Wang, Zaina N Al-Mohtaseb
Purpose: To identify the risk factors, causative organisms, antimicrobial susceptibility and outcomes of microbial keratitis in a large county hospital in Houston, Texas. Design: Case series. METHODS: Setting: A large county hospital in Houston, Texas. Study Population: Patients with known diagnosis of microbial keratitis from January 2011 to May 2015. Observation Procedure: Retrospective chart review. Main Outcomes: Epidemiology, risk factors, outcomes and antibiotic susceptibility of microbial keratitis...
March 23, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28336221/the-use-of-contact-lens-telescopic-systems-in-low-vision-rehabilitation
#6
REVIEW
Stephen J Vincent
Refracting telescopes are afocal compound optical systems consisting of two lenses that produce an apparent magnification of the retinal image. They are routinely used in visual rehabilitation in the form of monocular or binocular hand held low vision aids, and head or spectacle-mounted devices to improve distance visual acuity, and with slight modifications, to enhance acuity for near and intermediate tasks. Since the advent of ground glass haptic lenses in the 1930's, contact lenses have been employed as a useful refracting element of telescopic systems; primarily as a mobile ocular lens (the eyepiece), that moves with the eye...
March 20, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28333853/multimodal-imaging-in-vortex-vein-varices
#7
Chiara Veronese, Giovanni Staurenghi, Marco Pellegrini, Chiara Maiolo, Laura Primavera, Mariachiara Morara, Grayson W Armstrong, Antonio P Ciardella
PURPOSE: The aim of this study is to describe the clinical presentation of vortex vein varices with multimodal imaging. METHODS: The authors carried out a retrospective case series of eight patients (7 female, 1 male) with an average age of 60.2 years (min 8, max 84, median 68.5) presenting with vortex vein varices. All patients were evaluated at the Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy and at Luigi Sacco Hospital, University of Milan, Milan, Italy...
March 22, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28328726/clinical-outcomes-and-contact-lens-case-contamination-using-a-povidone-iodine-disinfection-system
#8
Jacqueline Tan, Ananya Datta, Katherine Wong, Mark D P Willcox, Ajay K Vijay
OBJECTIVE: To assess the incidence of adverse events during the use of a povidone-iodine disinfecting solution (cleadew) and the microbial contamination in contact lens cases. METHODS: A prospective, single-center, open-label, controlled study evaluating the use of cleadew cleaning and disinfecting system in existing daily wear soft contact lens wearers over a 3-month period was conducted. Ocular signs and symptoms during lens wear were assessed at baseline and after 1 and 3 months of using cleadew...
March 21, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28328724/effects-of-corneal-scars-and-their-treatment-with-rigid-contact-lenses-on-quality-of-vision
#9
Bram de Jong, Ivanka J E van der Meulen, Johannes M J van Vliet, Ruth Lapid-Gortzak, Carla P Nieuwendaal, Thomas J T P van den Berg
OBJECTIVES: To study the effects of corneal scars and the treatment of these scars with rigid gas-permeable (RGP) contact lenses on quality of vision including straylight. Visual effects were related to scar characteristics such as size and grade. METHODS: Straylight and best-corrected visual acuity were measured in 23 patients with corneal scars during and after RGP contact lens wear. Contralateral eyes were used as controls, and age-normal values in case of bilateral scars...
March 21, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28325674/-risk-factors-for-contact-lens-related-microbial-keratitis-a-multicenter-case-control-study
#10
P H Becmeur, F Abry, T Bourcier, N Meyer, A Sauer
PURPOSE: Currently, the most feared complication by ophthalmologists of contact lens (CL) wear is microbial keratitis (MK), even though its incidence remains low. It is also a significant financial burden for society. This study aimed to identify the risk factors for CL-related MK especially with regard to hygiene and pattern of use, in a large, prospective, multicenter, case-control study. METHODS: A multicenter retrospective case-control study was designed. The CL-related MK subpopulation (case) was compared with healthy CL wearers (control) using a 52-item anonymous questionnaire designed to determine subject demographics, lens wear history, lens type and disinfection solution, fitting, patient education, hygiene and maintenance of contact lenses, and patient history...
March 18, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28325305/rapid-synthesis-of-ethyl-cellulose-supported-platinum-nanoparticles-for-the-non-enzymatic-determination-of-h2o2
#11
Raj Karthik, Natarajan Karikalan, Shen-Ming Chen
Cellulose derivatives are one of the carbohydrate polymers which received a great interest in the construction of nanostructured materials. Particularly, the ethyl cellulose provides an enormous support to the metal nanoparticles. To the best of our knowledge, this is the first time report for the simple and rapid synthesis of ethyl cellulose (EC) supported platinum nanoparticles (PtNPs) for the determination of non-enzymatic hydrogen peroxide (H2O2). The PtNPs/EC composite was confirmed by various characterizations such as fourier transform infra-red spectra, energy dispersive X-ray spectra, field emission scanning electron microscope and cyclic voltammetry...
May 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28320674/simulation-study-of-an-ultrasound-retinal-prosthesis-with-a-novel-contact-lens-array-for-noninvasive-retinal-stimulation
#12
Mengdi Gao, Yanyan Yu, Huixia Zhao, Guofeng Li, Hongyang Jiang, Congzhi Wang, Feiyan Cai, Leanne Chan, Bernard Chiu, Wei Qian, Weibao Qiu, Hairong Zheng
Millions of people around the world suffer from varying degrees of vision loss (including complete blindness) because of retinal degenerative diseases. Artificial retinal prosthesis, which is usually based on electrical neurostimulation, are the most advanced technology for different types of retinal degeneration. However, this technology involves placing a device into the eyeball, and such a highly invasive procedure is inevitably highly risk and expensive. Ultrasound has been demonstrated to be a promising technology for noninvasive neurostimulation, making it possible to stimulate the retina and induce action potentials similar to those elicited by light stimulation...
March 15, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28319357/par3-in-chick-lens-placode-development
#13
Maraysa de Oliveira Melo, Ricardo Moraes Borges, Chao Yun Irene Yan
The lens originates from a simple cuboidal epithelium, which, on its basal side, contacts the optic vesicle, whilst facing the extraembryonic environment on its apical side. As this epithelium changes into the pseudostratified lens placode, its cells elongate and become narrower at their apical ends. This is due to the formation of an apical actin network, whose appearance is restricted to cells of the placodal region, as a result of region-specific signaling mechanisms that remain largely unknown. Here, we investigated the role of the polarity protein PAR3 and the phosphorylation state of its Threonine 833 (T833) aPKC-binding site in the recruitment of aPKC and in the establishment of actin network in the chick lens placode...
March 20, 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28317680/risk-for-microbial-keratitis-comparative-metaanalysis-of-contact-lens-wearers-and-post-laser-in-situ-keratomileusis-patients
#14
Jordan Masters, Mehmet Kocak, Aaron Waite
PURPOSE: To compare the risk for microbial keratitis in contact lens wearers stratified by wear schedule with the risk after laser in situ keratomileusis (LASIK). SETTING: Hamilton Eye Institute and Department of Ophthalmology, University of Tennessee Health Science Center, Memphis, Tennessee, USA. DESIGN: Comparative metaanalysis and literature review. METHODS: An extensive literature search was performed in the PubMed database between December 2014 and July 2015...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28317679/distinguishing-between-contact-lens-warpage-and-ectasia-usefulness-of-optical-coherence-tomography-epithelial-thickness%C3%A2-mapping
#15
Julie M Schallhorn, Maolong Tang, Yan Li, Derek J Louie, Winston Chamberlain, David Huang
PURPOSE: To distinguish between corneal ectasia and contact lens-related warpage by characteristic patterns on corneal topography and optical coherence tomography (OCT) epithelial thickness maps. SETTING: Casey Eye Institute, Portland, Oregon, USA. DESIGN: Prospective and retrospective case series. METHODS: Axial and mean power maps were obtained on corneal topography systems. Epithelial thickness maps were generated using RTVue OCT...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28306352/evaluation-of-the-tear-function-tests-and-the-ocular-surface-in-first-time-users-of-silicone-hydrogel-contact-lenses
#16
Yelda Yildiz Tasci, Canan Gürdal, Ozge Sarac, Aykut Onusever
PURPOSE: To evaluate the effects of three different silicone hydrogel contact lenses (SHCL), (balafilcon A, senofilcon A, and comfilcon A) on tear function tests, corneal thickness, and ocular surface cytology in first time contact lens users. MATERIALS AND METHODS: In this prospective study, 120 eyes of 60 subjects were evaluated. Balafilcon A users were designated as group 1, senofilcon A users as group 2, and comfilcon A users as group 3. In all cases, before and after 6 months of contact lens wear, ocular surface disease index score (OSDI), tear breakup time (TBUT), Schirmer 1 test, central corneal thickness (CCT), central corneal epithelium thickness (CCET), and conjunctival impression cytology samples were evaluated...
March 17, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28303823/bacterial-and-fungal-biofilm-formation-on-contact-lenses-and-their-susceptibility-to-lens-care-solutions
#17
Siddharth Kackar, Ethel Suman, M Shashidhar Kotian
BACKGROUND: Microbial biofilm formation on contact lenses and lens storage cases may be a risk factor for contact lens-associated corneal infections. Various types of contact lens care solutions are used to reduce microbial growths on lenses. OBJECTIVES: The present study aimed at comparing the growths of biofilms on the different contact lenses and lens cases. The study also aimed at determining the effect of lens care solutions and bacteriophage on these biofilms...
January 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28301480/management-and-modeling-approaches-for-controlling-raccoon-rabies-the-road-to-elimination
#18
REVIEW
Stacey A Elmore, Richard B Chipman, Dennis Slate, Kathryn P Huyvaert, Kurt C VerCauteren, Amy T Gilbert
Rabies is an ancient viral disease that significantly impacts human and animal health throughout the world. In the developing parts of the world, dog bites represent the highest risk of rabies infection to people, livestock, and other animals. However, in North America, where several rabies virus variants currently circulate in wildlife, human contact with the raccoon rabies variant leads to the highest per capita population administration of post-exposure prophylaxis (PEP) annually. Previous rabies variant elimination in raccoons (Canada), foxes (Europe), and dogs and coyotes (United States) demonstrates that elimination of the raccoon variant from the eastern US is feasible, given an understanding of rabies control costs and benefits and the availability of proper tools...
March 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28300746/a-unique-case-of-keratoconus-with-cogan-reese-syndrome-and-secondary-glaucoma
#19
Lipi Chakrabarty
Keratoconus (KC), though one of the most common corneal degeneration, still continues to be a mystique regarding its pathogenesis, diagnosis, associations, and management; with newer discoveries and evolutions being reported. We report, what we believe to be another new association of KC- Cogan Reese syndrome with secondary glaucoma. A 32-year-old male, diagnosed as bilateral KC, presented for examination. Unilateral Cogan-Reese syndrome and associated secondary glaucoma was identified. These associations had been missed by previous ophthalmologists...
January 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28298316/paediatric-infectious-keratitis-a-case-series-of-107-children-presenting-to-a-tertiary-referral-centre
#20
Julia Dutra Rossetto, Kara M Cavuoto, Carla J Osigian, Ta Chen Peter Chang, Darlene Miller, Hilda Capo, Oriel Spierer
BACKGROUND/AIMS: Corneal ulcers can result in severe visual impairment in children. The recent trends of paediatric microbial ulcerative keratitis in the USA are unknown. The purpose of this study is to report the risk factors, microbiological profile and treatment outcomes of paediatric microbial keratitis in South Florida. METHODS: A university-based tertiary eye care centre retrospective case series between 1992 and 2015. Medical records of 107 paediatric patients (age <18 years) with the diagnosis of microbial ulcerative keratitis were analysed...
March 15, 2017: British Journal of Ophthalmology
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