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https://www.readbyqxmd.com/read/28099282/risk-factors-for-acanthamoeba-keratitis-a-multistate-case-control-study-2008-2011
#1
Allison C Brown, Jonathan Ross, Daniel B Jones, Sarah A Collier, Tracy L Ayers, Robert M Hoekstra, Bryon Backensen, Sharon L Roy, Michael J Beach, Jonathan S Yoder
OBJECTIVE: To identify modifiable risk factors contributing to Acanthamoeba keratitis (AK) infection. METHODS: A case-control investigation was conducted. Case patients were soft contact lens wearers with laboratory-confirmed AK. Control were soft contact lens wearers ≥12 years of age, with no history of AK. Case patients were recruited from 14 ophthalmology referral centers and a clinical laboratory. Control were matched on state of residence and type of primary eye care provider (ophthalmologist or optometrist)...
January 17, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28099240/inter-relationship-of-soft-contact-lens-diameter-base-curve-radius-and-fit
#2
Graeme Young, Lee Hall, Anna Sulley, Kathrine Osborn-Lorenz, James S Wolffsohn
PURPOSE: To evaluate the inter-relationship of soft contact lens base curve radius (BC), diameter, and lens fit using a mathematical model. METHODS: A spreadsheet mathematical model was used to evaluate theoretical fitting characteristics for various combinations of soft lens BC and diameter. The designs were evaluated using ocular topography data collected from 163 UK subjects. The model evaluated lens tightness (edge strain) and on-eye diameter (horizontal corneal overlap) and assumed that acceptable values fell within the range 0 to 6% and 0...
January 18, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28073689/corneo-scleral-contact-lens-in-a-piggyback-system-for-keratoconus-a-case-report
#3
Esteban Porcar, Juan Carlos Montalt, Enrique España-Gregori, Cristina Peris-Martínez
PURPOSE: We describe a case of fitting a corneo-scleral contact lens with a multi-aspheric geometry design (MAGD CScL) on top of a daily silicone hydrogel lens (piggyback system) for keratoconus management. METHODS: A 48-year-old man using soft toric contact lenses required an improvement in the unsatisfactory quality of his vision. He presented with bilateral asymmetric keratoconus with high myopia in the right eye (RE) and severe myopia in the left eye (LE). In addition, he had low vision in his LE because of a maculopathy...
January 7, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28067859/a-wirelessly-powered-smart-contact-lens-with-reconfigurable-wide-range-and-tunable-sensitivity-sensor-readout-circuitry
#4
Jin-Chern Chiou, Shun-Hsi Hsu, Yu-Chieh Huang, Guan-Ting Yeh, Wei-Ting Liou, Cheng-Kai Kuei
This study presented a wireless smart contact lens system that was composed of a reconfigurable capacitive sensor interface circuitry and wirelessly powered radio-frequency identification (RFID) addressable system for sensor control and data communication. In order to improve compliance and reduce user discomfort, a capacitive sensor was embedded on a soft contact lens of 200 μm thickness using commercially available bio-compatible lens material and a standard manufacturing process. The results indicated that the reconfigurable sensor interface achieved sensitivity and baseline tuning up to 120 pF while consuming only 110 μW power...
January 7, 2017: Sensors
https://www.readbyqxmd.com/read/28060146/combined-effect-of-ocular-and-multifocal-contact-lens-induced-aberrations-on-visual-performance-center-distance-versus-center-near-design
#5
Daniela Lopes-Ferreira, Paulo Fernandes, António Queirós, José M González-Meijome
PURPOSE: To evaluate the combined effects of inherent ocular aberrations and induced aberrations with a multifocal soft contact lens (MFCL) after 15 days of lens wear in presbyopic participants and their influence on visual performance at distance and near under high and low contrast conditions. METHODS: Forty presbyopic participants (mean age, 48.7±3.4) presenting a mean addition of 1.53±0.58 D were fitted with Biofinity Multifocal (CooperVision) and included in the study...
January 4, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28059368/measurement-of-thickness-and-profile-of-a-transparent-material-using-fluorescent-stereo-microscopy
#6
Zhenxing Hu, Tingge Xu, Huiyang Luo, Rong Z Gan, Hongbing Lu
Full-field thickness measurement for a thin transparent film is of interest for biological, medical, electronic, and packaging materials. It is a challenging task when the film is curvy, delicate and its thickness varies with location. We report herein a method to measure the thickness of a transparent (flat or curved) material and its topography using a stereo fluorescent profilometry technique. In this technique, two different types of fluorescent particles are deposited to both sides of the transparent film...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28030882/ocular-response-to-environmental-variations-in-contact-lens-wearers
#7
Alberto López-de la Rosa, Vicente Martín-Montañez, Alberto López-Miguel, Itziar Fernández, Margarita Calonge, José M González-Méijome, María J González-García
PURPOSE: To assess the influence of different indoor environments simulated in an environmental chamber on soft contact lens (CL) wearers. METHODS: Fifty-four CL wearers were grouped based on their symptoms while wearing their CLs. Subjects were fitted with two different CL types, conventional hydrogel (Omafilcon A) and silicone hydrogel (comfilcon A), and exposed to two controlled indoor environmental conditions, standard [50% relative humidity (RH), 23°C, 930 mb of atmospheric pressure] and adverse (in-flight air cabin environment: 5% RH, localised air flow, 23°C, 750 mb atmospheric pressure), for 90 min in an environmental chamber, making a total of four visits...
January 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/27902509/paecilomyces-lilacinus-keratitis-in-a-soft-contact-lens-wearer
#8
Rosa Monno, Giovanni Alessio, Silvana Guerriero, Carmen Capolongo, Carla Calia, Luciana Fumarola, Carlo Pazzani, Anna Di Taranto, Giuseppe Miragliotta
We describe a case of keratitis caused by Paecilomyces lilacinus in a contact lens wearer with a history of diabetes.
November 29, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27898516/clinical-evaluation-of-large-diameter-rigid-gas-permeable-versus-soft-toric-contact-lenses-for-the-correction-of-refractive-astigmatism-a-multicenter-study
#9
Langis Michaud, Edward S Bennett, Stephanie L Woo, Renee Reeder, Bruce W Morgan, Amy Dinardo, Jennifer S Harthan
PURPOSE: This study aims to address the clinical performance of a large diameter rigid gas permeable lens (LRGP) in a group of subjects with low-to-moderate (0.75-2.75 D) refractive astigmatism. An additional goal was to determine whether soft toric or LRGP contact lenses performed better objectively in the correction of astigmatism and to determine which modality is preferred by subjects. METHODS: This was a multisite prospective cross-over clinical study. Ten asymptomatic contact lens wearers per site (four university clinics) were recruited and randomly assigned to group A or group B...
November 24, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27880992/studies-using-concentric-ring-bifocal-and-peripheral-add-multifocal-contact-lenses-to-slow-myopia-progression-in-school-aged-children-a-meta-analysis
#10
Shi-Ming Li, Meng-Tian Kang, Shan-Shan Wu, Bo Meng, Yun-Yun Sun, Shi-Fei Wei, Luoru Liu, Xiaoxia Peng, Zhuo Chen, Fengju Zhang, Ningli Wang
PURPOSE: To evaluate the effect of soft contact lens with concentric ring bifocal and peripheral add multifocal designs on controlling myopia progression in school-aged children. METHODS: We systematically searched MEDLINE, EMBASE, Cochrane Library and reference lists of included trials. Methodological quality of included trials was assessed using Jadad Scale and Newcastle-Ottawa Quality Assessment Scale items. RESULTS: We identified five randomised controlled trials (RCTs) and three cohort studies with a total of 587 myopic children...
January 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/27879499/impact-of-spherical-aberration-terms-on-multifocal-contact-lens-performance
#11
Cathleen Fedtke, Jennifer Sha, Varghese Thomas, Klaus Ehrmann, Ravi C Bakaraju
PURPOSE: To investigate the impact of the primary (PSA) and secondary (SSA) spherical aberration terms on visual performance (VP) in presbyopes, as measured using multifocal (MFCL) soft contact lenses on eye. METHODS: Seventeen presbyopes (age: 55.1 ± 6.9 years) wore seven commercial lenses (four center-near (MFCL N), one center-distance (MFCL D), one bifocal, and one single vision control). Unaided and with each lens on eye, the PSA and SSA terms were obtained with an aberrometer, the BHVI-EyeMapper (low illumination, natural and 4 mm pupil diameter)...
November 22, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27870779/painless-acanthamoeba-keratitis-with-normal-vision
#12
Pui Wai Rachel Kwok, Ka Wai Kam, Vishal Jhanji, Alvin L Young
PURPOSE: To report an atypical case of contact lens-related Acanthamoeba keratitis. CASE REPORT: A 15-year-old secondary school female student with a history of soft contact lens wear was referred to our hospital by a private general practitioner for management of right eye redness and discomfort for 2 weeks. Upon examination, the best-corrected visual acuity was 20/20 and 20/16 for her right and left eyes, respectively. There was diffuse radial keratoneuritis noted in the cornea of her right eye without any associated epithelial defect...
November 19, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27866955/analysis-of-the-power-profile-of-a-new-soft-contact-lens-for-myopia-progression
#13
Javier Ruiz-Alcocer
No abstract text is available yet for this article.
November 17, 2016: Journal of Optometry
https://www.readbyqxmd.com/read/27861262/tear-film-osmolarity-in-response-to-long-term-orthokeratology-treatment
#14
Amelia Nieto-Bona, María Nombela-Palomo, Gema Felipe-Márquez, Miguel A Teus
PURPOSE: To compare tear film osmolarity (TFO) measurements in non-contact lens (CL) wearers and wearers of hydrogel or overnight orthokeratology (OK) CLs, and to assess possible effects of long-term OK on TFO. METHODS: Overall, 108 subjects with moderate myopia participated in 2 experiments, and TFO was measured using the TearLab osmolarity system. In experiment 1, TFO measurements were made in 77 right eyes of 23 non-CL wearers, 26 hydrogel wearers, and 28 OK wearers...
November 16, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27818113/factors-in-the-success-of-new-contact-lens-wearers
#15
Anna Sulley, Graeme Young, Chris Hunt
PURPOSE: To determine the first-year retention rate for patients fitted with contact lenses (CLs) and identify factors associated with retention and dropout. METHODS: This multi-site study was a retrospective chart review of the status of neophyte CL wearers fitted in representative UK eye care practices. RESULTS: Consecutive records for 524 patients at 29 sites were reviewed. Mean age at dispensing was 34 years (range 8-79), 68% were under 45 years and 61% female...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27800638/soft-multifocal-simultaneous-image-contact-lenses-a-review
#16
REVIEW
Roque Pérez-Prados, David P Piñero, Rafael J Pérez-Cambrodí, David Madrid-Costa
Soft multifocal simultaneous image contact lenses have boomed in recent years due to the growing number of presbyopic patients demanding visual solutions, allowing them to maintain their current standard of living. The concept of 'simultaneous image' is based on blur interpretation and/or blur tolerance of superimposed multiple images on the retina formed by various powers of a contact lens. This is the basis for a specific type of multifocal contact lens developed for the compensation of presbyopia. Manufacturers have released a great variety of soft simultaneous image lens designs to meet different patient needs but their fitting is still unsatisfactory in some cases...
November 1, 2016: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/27791229/raman-imaging-of-layered-soft-contact-lenses
#17
Katarzyna Krysztofiak, Kamila Ciężar, Mikołaj Kościński
BACKGROUND: Daily disposable contact lenses are gaining in popularity among practitioners and wearers for the improved ocular health and subjective outcomes they offer. Recently a novel daily disposable contact lens material with water gradient technology was introduced. Delefilcon A lenses consist of a 33% water content silicone hydrogel core and an outer hydrogel layer which is totally free of silicone and contains 80% water. METHODS: The aim of the present study was to confirm the layered structure of delefilcon A contact lenses...
October 27, 2016: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/27790772/temporal-changes-in-contact-lens-comfort-over-a-day-of-wear
#18
Craig A Woods, Sharon A Bentley, Desmond Fonn
PURPOSE: Contact lens discomfort continues to be reported as the primary reason for soft lens discontinuation, regardless of new modalities and materials. The purpose of this analysis of comfort related data from a series of clinical studies was to review whether there was a difference between symptomatic and asymptomatic habitual lens wearers' comfort responses over the course of the day. METHODS: Data from five independent non-dispensing clinical studies were pooled and analysed...
November 2016: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/27767354/long-term-efficacy-of-orthokeratology-contact-lens-wear-in-controlling-the-progression-of-childhood-myopia
#19
Jacinto Santodomingo-Rubido, César Villa-Collar, Bernard Gilmartin, Ramón Gutiérrez-Ortega, Keiji Sugimoto
PURPOSE: The primary outcome of this study is to compare the axial length growth of white European myopic children wearing orthokeratology contact lenses (OK) to a control group (CT) over a 7-year period. METHODS: Subjects 6-12 years of age with myopia -0.75 to -4.00DS and astigmatism ≤1.00DC were prospectively allocated OK or distance single-vision spectacles (SV) correction. Measurements of axial length (Zeiss IOLMaster), corneal topography, and cycloplegic refraction were taken at 6-month intervals over a 2-year period...
October 21, 2016: Current Eye Research
https://www.readbyqxmd.com/read/27755286/multicenter-testing-of-a-risk-assessment-survey-for-soft-contact-lens-wearers-with-adverse-events-a-contact-lens-assessment-in-youth-study
#20
Luigina Sorbara, Aaron B Zimmerman, G Lynn Mitchell, Kathryn Richdale, Dawn Y Lam, Beth T Kinoshita, Robin L Chalmers, Heidi Wagner
PURPOSE: To test the ability of responses to the Contact Lens Assessment in Youth (CLAY) Contact Lens Risk Survey (CLRS) to differentiate behaviors among participants with serious and significant (S&S) contact lens-related corneal inflammatory events, those with other events (non-S&S), and healthy controls matched for age, gender, and soft contact lens (SCL) wear frequency. METHODS: The CLRS was self-administered electronically to SCL wearers presenting for acute clinical care at 11 clinical sites...
October 13, 2016: Eye & Contact Lens
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