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https://www.readbyqxmd.com/read/29047788/analysis-on-multifocal-contact-lens-design-based-on-optical-power-distribution-with-nurbs
#1
Lien T Vu, Chao-Chang A Chen, Patrick Joi-Tsang Shum
This paper aims to develop and analyze the design method of multifocal contact lenses to obtain curvature continuity in the optical surfaces with the high addition (Add) powers by adjusting non-uniform rational B-spline (NURBS) curves. The paper has developed mathematical formulae to generate the optical power distributions in which the powers continuously change from either near or distant center to the opposite focal length in the periphery of the optical region with different change rates and Add power values...
October 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29044738/overview-of-mechanisms-of-antibiotic-resistance-in-pseudomonas-aeruginosa-an-ocular-perspective
#2
REVIEW
Dinesh Subedi, Ajay Kumar Vijay, Mark Willcox
Treatment of Pseudomonas aeruginosa eye infections often becomes a challenge due to the ability of this bacterium to be resistant to antibiotics via intrinsic and acquired mechanisms. Transfer of resistance due to interchangeable genetic elements is an important mechanism for the rapid transfer of antibiotic resistance in this pathogen. As a result, drug-resistant strains are becoming increasingly prevalent worldwide. This review systematically analyses data from recent publications to describe the global prevalence and antibiotic sensitivity of ocular P...
October 18, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/29041201/single-lens-logarithmic-confocal-distance-measurement-array
#3
Jin Wang
This article presents a method and results based on confocal microscopy for non-contact axial distance measurement from a lens to a partially reflective surface using an array of photodetectors. The ratio of the photodetector signals is independent of the surface reflectivity and light source variations over a range of distance. By using logarithmic photodetector signals the object distance is proportional to the difference between the signals. This technique potentially allows measurement of sound produced by single living cells, or the high velocity surface shape changes in the hohlraum in laser fusion experiments...
October 16, 2017: Optics Express
https://www.readbyqxmd.com/read/29040199/in-vitro-effect-of-lysozyme-on-albumin-deposition-to-hydrogel-contact-lens-materials
#4
Negar Babaei Omali, Lakshman N Subbaraman, Miriam Heynen, Zohra Fadli, Chantal Coles-Brennan, Lyndon W Jones
SIGNIFICANCE: Albumin deposition on contact lenses could be detrimental to contact lens (CL) wear because this may increase the risk of bacterial binding and reduce comfort. Lysozyme deposition on selected lens materials would reduce albumin deposition on lenses. PURPOSE: This study aims to determine if lysozyme deposition on CLs could act as a barrier against subsequent albumin adsorption, using an in vitro model. METHODS: Six hydrogel CL materials (etafilcon A, polymacon, nelfilcon A, omafilcon A, ocufilcon B, and nesofilcon A) were evaluated...
October 16, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/29034156/intraocular-lens-opacification-after-descemet-s-stripping-automated-endothelial-keratoplasty
#5
Meng-Sheng Lee, I-Lun Tsai, Ching-Yao Tsai, Li-Lin Kuo, Shiow-Wen Liou, Lin-Chung Woung
Compared with conventional penetrating keratoplasty, Descemet's stripping automated endothelial keratoplasty (DSAEK) more effectively maintain global integrity and rapid vision rehabilitation with less ocular surface disorders in patients with endothelial dysfunction. Here, we report a case of a 76-year-old woman who experienced opacification of a hydrophilic intraocular lens (IOL) approximately 10 months after DSAEK. The patient with no history of systemic disease developed pseudophakic bullous keratopathy in the right eye 2 years after undergoing cataract surgery...
July 2017: Taiwan Journal of Ophthalmology
https://www.readbyqxmd.com/read/29033270/a-survey-of-contact-lens-related-complications-in-a-tertiary-hospital-in-china
#6
Weiwei Li, Xuguang Sun, Zhiqun Wang, Yang Zhang
PURPOSE: To describe the type of complications related to contact lens (CL) wear in a tertiary hospital in XX, China. METHODS: A retrospective study of 141 patients who complained discomfort after wearing contact lens on an outpatient basis of XX Hospital were conducted from the January 2012 to December 2015. The data included patients' demographics, lens type, history, slit-lamp examination, reports of corneal scrapings, culture, and examination of in vivo confocal microscopy...
October 12, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29032921/treatment-of-contact-lens-related-dry-eye-with-antibacterial-honey
#7
Daniel Wong, Julie M Albietz, Huan Tran, Cimonette Du Toit, Anita Hui Li, Tina Yun, Jee Han, Katrina L Schmid
AIM: Contact lens induced dry eye affects approximately 50% of contact lens wearers. The aim was to assess the effects of Manuka (Leptospermum sp.) honey eye drops (Optimel, Melcare, Australia) on dry eye in contact lens wearers. The safety of the honey eye drops in contact lens wear and contact lens wearers' compliance were also evaluated. DESIGN: Prospective, randomised, cross over study, examiner masked, pilot treatment trial. METHODS: Twenty-four participants aged 20 to 55 years with contact lens related dry eye were recruited and randomised to two treatment groups; 20 completed the study...
October 9, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29023989/impact-of-contact-lens-material-and-design-on-the-ocular-surface
#8
Javier Ruiz-Alcocer, Daniel Monsálvez-Romín, Santiago García-Lázaro, César Albarrán-Diego, José Luis Hernández-Verdejo, David Madrid-Costa
BACKGROUND: To evaluate the impact on the ocular surface of a daily disposable hydrogel contact lens with high water content compared with two silicone hydrogel daily disposable lenses of lower water content. METHODS: The hydrogel lens assessed was made from nesofilcon A and the silicone hydrogel lenses were made of delefilcon A and stenfilcon A. Contact lens thickness was measured to assess material stability during daily wear, and ocular surface parameters such as tear film osmolarity, tear meniscus area and central corneal thickness were also assessed...
October 11, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/29023313/mini-scleral-lenses-for-correction-of-refractive-errors-after-radial-keratotomy
#9
Hsiao-Sang Chu, I-Jong Wang, Grace A Tseng, Wei-Li Chen, Yu-Chih Hou, Fung-Rong Hu
OBJECTIVE: To evaluate the factors affecting clinical outcomes of correcting cumulative refractive errors or irregular astigmatism after radial keratotomy (RK) using mini-scleral lenses. METHODS: We retrospectively analyzed 36 eyes receiving mini-scleral lenses after RK from July 2011 to June 2016. Analyses included age, refractive errors, best spectacle-corrected visual acuity (BSCVA), best contact lens-corrected visual acuity (BCLCVA), topographic indices, RK treatment zone diameter (TZD), power difference (PrD) within the RK treatment zone, and decentration distance (DD) of the RK treatment zone center...
October 11, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/29023311/comparison-of-extended-depth-of-focus-prototype-contact-lenses-with-the-1-day-acuvue-moist-multifocal-after-one-week-of-wear
#10
Jennifer Sha, Daniel Tilia, Danny Kho, Jennie Diec, Varghese Thomas, Ravi C Bakaraju
OBJECTIVES: To compare visual performance of extended depth-of-focus (EDOF) prototypes with a new, center-near, commercial, multifocal contact lens. METHODS: Presbyopic participants (n=57) wore 1-Day ACUVUE MOIST MULTIFOCAL (1DAMM) and an EDOF prototype for one week in a double-masked, prospective, cross-over, randomized clinical trial. Manufacturers' guide was used to select the first pair of lens to be fit based on subjective distance refraction and near addition...
October 11, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/29022964/nocardia-arthritidis-keratitis-case-report-and-review-of-the-literature
#11
Andrew Gieger, Stephen Waller, Joseph Pasternak
INTRODUCTION: Keratitis due to Nocardia infection is not commonly encountered in clinical practice and may therefore be mistaken for fungal or viral keratitis leading to delayed treatment and increased risk of permanent visual impairment. CASE: An otherwise healthy 27 years old Caucasian Active Duty military member presented to the clinic with three days of light sensitivity and irritation of his right eye. He carried a history of PRK in both eyes six years prior and admitted to recent contact lens overuse...
January 2017: Nepalese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29022291/comparison-of-contact-lens-corrected-quality-of-vision-and-life-of-keratoconus-and-myopic-patients
#12
Sunghoon Lee, Gangwook Jung, Hyung Keun Lee
PURPOSE: To compare and analyze changes in vision quality, subjective symptoms, and psycho-social satisfaction in keratoconus and myopic patients following the wearing of contact lenses. METHODS: This study enrolled 25 keratoconus and 25 myopic patients with corrected vision over 0.8 according to the Snellen chart due to treatment with contact lenses. Patients were surveyed prior to the wearing of contact lenses, and again after three months of contact lens usage with a questionnaire about quality of vision and life...
August 26, 2017: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/29017826/disability-glare-in-soft-multifocal-contact-lenses
#13
Siegfried Wahl, Luise Fornoff, G Alex Ochakovski, Arne Ohlendorf
PURPOSE: The study investigated the effect of the design of multifocal contact lenses on the sensitivity to contrast and disability glare. METHODS: Contrast sensitivity was measured in 16 young adults (mean age: 25.5±2.5years) at a distance of 2m under two conditions: no-glare and glare. Two designs (Center Near and Center Distance) of the Biofinity soft contact lens were used to simulate correction for presbyopes, while a correction with single vision trial lenses and contact lenses acted as controls...
October 7, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28993355/bilateral-fungal-keratitis-with-ring-infiltrates-a-rare-scenario
#14
Manthan Hasmukhbhai Chaniyara, Amar Pujari, Jayanand Urkude, Namrata Sharma
A 12-year-old boy presented to the emergency department with chief complaints of pain, redness, discharge and diminution of vision in both eyes over the previous 20 days. There was no history of preceding trauma, contact lens use, any eye drop usage or ocular surgery. Systemic history was not significant. Presenting uncorrected visual acuity in his right eye was counting fingers at 1 m and 20/200 in the left eye, with accurate projection of rays in both eyes. Slit lamp biomicroscopy showed the presence of bilateral diffuse conjunctival congestion, corneal ring infiltrates and epithelial defect with corneal oedema...
October 9, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28993070/the-effect-of-soft-contact-lens-thickness-in-visual-function-after-intracorneal-ring-segments-surgery
#15
G Carracedo, J Canales, P Gonzalez, A Rechionni, C Carpena-Torres, J Carballo-Álvarez
OBJECTIVE: To study the influence of soft contact lens (SCL) central thickness and material in keratoconus on visual function after intracorneal ring segment (ICRS) surgery. METHODS: A pilot, experimental, prospective, cross-sectional and double-blind study was performed. Fourteen keratoconus patients with age range of 34.75±9.22years (7 males and 7 females) with ICRS implanted were involved in the study. Two different SCL materials [Hioxifilcon A (G-5X/p-GMA/HEMA) and Lucifilcon A (silicone-hydrogel)] with four different central thicknesses (0...
October 6, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28993069/discrimination-of-subjective-responses-between-contact-lenses-with-a-novel-questionnaire
#16
Jennie Diec, Thomas Naduvilath, Daniel Tilia, Eric B Papas, Percy Lazon de la Jara
PURPOSE: To describe a ranked symptoms scale (RSS) discriminating subjective responses in contact lens (CL) wear in various situations. METHOD: Forty experienced clinical trial participants were interviewed for their perceptions of ocular comfort scales, resulting in a numerical RSS. For further evaluation, 20 CL wearers enrolled into a prospective, randomised, crossover trial. Two silicone-hydrogel CLs and a lens care solution (LCS) [Combinations A & B] were selected based on prior performance identifying best/worst combinations for end-of-day comfort...
October 6, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28992804/surface-modification-of-model-hydrogel-contact-lenses-with-hyaluronic-acid-via-thiol-ene-click-chemistry-for-enhancing-surface-characteristics
#17
Myrto Korogiannaki, Jianfeng Zhang, Heather Sheardown
Discontinuation of contact lens wear as a result of ocular dryness and discomfort is extremely common; as many as 26% of contact lens wearers discontinue use within the first year. While patients are generally satisfied with conventional hydrogel lenses, improving on-eye comfort continues to remain a goal. Surface modification with a biomimetic, ocular friendly hydrophilic layer of a wetting agent is hypothesized to improve the interfacial interactions of the contact lens with the ocular surface. In this work, the synthesis and characterization of poly(2-hydroxyethyl methacrylate) surfaces grafted with a hydrophilic layer of hyaluronic acid are described...
October 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28991336/four-stage-procedure-for-keratoconus-icrs-implantation-corneal-cross-linking-toric-phakic-intraocular-lens-implantation-and-topography-guided-photorefractive-keratectomy
#18
Efekan Coskunseven, Daya Papalkar Sharma, Michael A Grentzelos, Onurcan Sahin, George D Kymionis, Ioannis Pallikaris
PURPOSE: To evaluate a four-stage combined treatment for keratoconus including intrastromal corneal ring segment (ICRS) implantation followed by corneal cross-linking (CXL), toric phakic intraocular lens (IOL) implantation, and topography-guided photorefractive keratectomy (TG-PRK). METHODS: In this retrospective interventional case series, 11 eyes of 7 patients with progressive keratoconus were treated with a four-stage procedure including the following: Keraring ICRS (Mediphacos Ltda, Belo Horizonte, Brazil) implantation followed by CXL, phakic IOL implantation, and TG-PRK (minimum 6 months between each stage)...
October 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28987448/fungal-keratitis
#19
REVIEW
T Bourcier, A Sauer, A Dory, J Denis, M Sabou
Fungal keratitis, or keratomycoses, are corneal infections which must be considered in cases of corneal trauma, prior corneal surgery, chronic ocular surface disease, topical corticosteroids or contact lens wear. Filamentous fungi or yeasts may be involved. Presenting clinical features such as corneal infiltrates with feathery edges and/or raised surface, intact epithelium with deep stromal involvement, satellite lesions, endothelial plaques, lack of improvement with antibiotics and worsening with steroids are suggestive of fungal keratitis...
October 4, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28985803/flashes-and-floaters-a-survey-of-canadian-ophthalmology-residents-practice-patterns
#20
Parnian Arjmand, Bernard Hurley
BACKGROUND: Residents are often the first point of contact in assessing patients who present with "flashes and floaters" in the emergency ophthalmology clinic. Most often, these symptoms are attributed to a posterior vitreous detachment (PVD), which may be associated with a retinal tear in up to 14% of cases. A proper peripheral retinal exam is, thus, imperative, and techniques other than scleral depression may not be sufficient. We conducted a cross-sectional survey of Canadian ophthalmology residents-in-training to understand the current resident practice patterns for examination of the peripheral retina...
October 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
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