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Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association

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https://www.readbyqxmd.com/read/28073689/corneo-scleral-contact-lens-in-a-piggyback-system-for-keratoconus-a-case-report
#1
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/28057440/new-web-based-algorithm-to-improve-rigid-gas-permeable-contact-lens-fitting-in-keratoconus
#2
Sara Ortiz-Toquero, Guadalupe Rodriguez, Victoria de Juan, Raul Martin
PURPOSE: To calculate and validate a new web-based algorithm for selecting the back optic zone radius (BOZR) of spherical gas permeable (GP) lens in keratoconus eyes. METHODS: A retrospective calculation (n=35; multiple regression analysis) and a posterior prospective validation (new sample of 50 keratoconus eyes) of a new algorithm to select the BOZR of spherical KAKC design GP lenses (Conoptica) in keratoconus were conducted. BOZR calculated with the new algorithm, manufacturer guidelines and APEX software were compared with the BOZR that was finally prescribed...
January 2, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28038841/discontinuation-of-orthokeratology-on-eyeball-elongation-doee
#3
P Cho, S W Cheung
PURPOSE: To evaluate and compare changes in axial elongation, over a 14-month period, in subjects who discontinued and then resumed ortho-k lens wear with those who continued to wear their lenses or spectacles following a 2-year myopia control study. METHOD: This single masked, prospective study recruited subjects who had just completed a 2-year myopia control study. Ortho-k subjects were classified as Group OKc, in which subjects continued ortho-k lens wear for the duration of the study; or Group OKd in which subjects discontinued lens wear for seven months and wore single-vision spectacles (Phase I) and then resumed ortho-k lens wear for another seven months (Phase II)...
December 27, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27993459/corneal-epithelial-bullae-after-short-term-wear-of-small-diameter-scleral-lenses
#4
Alex D Nixon, Joseph T Barr, Dean A VanNasdale
Complications of scleral lens wear are not well documented or understood. While multiple studies focus on oxygen transmission during scleral lens wear and associated corneal swelling, little is known about the effects of varying scleral lens fitting relationships, especially when there is corneal interaction. Scleral lenses, by convention, are designed to completely clear the corneal surface and rest on the conjunctival and scleral tissue. However, some designs maximize oxygen transmission by reducing the lens diameter, thickness, and recommended corneal clearance...
December 16, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27986387/an-observational-cross-sectional-study-on-the-corneal-endothelium-of-medium-term-rigid-gas-permeable-contact-lens-wearers
#5
Michael J Doughty
PURPOSE: To assess if polymegethism and pleomorphism were evident in corneal endothelium after medium-term rigid gas permeable (RGP) contact lens wear. METHODS: In a cross-sectional observational study over 12 years, single images of the central region of the corneal endothelium of one eye of 46 subjects were taken with a non-contact specular microscope, along with a measure of central corneal thickness (CCT). The images were printed onto A3-sized paper and 100 cells/image measured by planimetry...
December 13, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27964894/corneal-biomechanical-metrics-of-healthy-chinese-adults-using-corvis-st
#6
Wei Wang, Miao He, Hong He, Chi Zhang, He Jin, Xingwu Zhong
PURPOSE: To evaluate the corneal biomechanical metrics by Corvis ST (CST) in healthy Chinese adults. METHODS: This cross-sectional study used CST to measure intraocular pressure (IOP), central corneal thickness (CCT), and corneal biomechanical parameters, including time, velocity, length, deformation amplitude at the first (A1T, A1V, A1L, A1DA) and second applanation (A2T, A2V, A2L, A2DA), time, radius curvature and deformation amplitude at highest concavity (HCT, HCR, HCDA) and peak distance (PD)...
December 10, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27956045/biomechanical-properties-of-early-keratoconus-suppressed-deformation-signal-wave
#7
Hassan Hashemi, Asghar Beiranvand, Abbasali Yekta, Amir Asharlous, Mehdi Khabazkhoob
PURPOSE: To examine the diagnostic validity of different corneal biomechanical parameters for the detection of early keratoconus METHODS: Sixty-one eyes with a diagnosis of early keratoconus and 61 topographically normal eyes were enrolled in the study. All participants underwent testing with the Ocular Response Analyzer (ORA), and 40 indices from each cornea were included in the analysis. RESULTS: The mean (standard deviation: SD) of keratometry and central corneal thickness in keratoconic corneas was 46...
December 9, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27931882/evaluation-of-the-diagnostic-ability-of-vector-parameters-characterizing-the-corneal-astigmatism-and-regularity-in-clinical-and-subclinical-keratoconus
#8
Antonio Martínez-Abad, David P Piñero, Pedro Ruiz-Fortes, Alberto Artola
PURPOSE: To evaluate the diagnostic ability of the vector parameters ocular residual astigmatism (ORA), topography disparity (TD) and topographic astigmatism CorT (anterior and total) for the detection of clinical and subclinical keratoconus, and to develop a detection model based on them. METHODS: This study comprised a total of 61 keratoconus eyes (KC group), 19 eyes with subclinical keratoconus (SKC group) and 100 healthy eyes (control group). In all cases, a complete eye exam was performed including an analysis of the corneal structure with the Sirius system (Costruzione Strumenti Oftalmici, CSO)...
December 5, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27884616/mechanical-properties-of-contact-lenses-the-contribution-of-measurement-techniques-and-clinical-feedback-to-50-years-of-materials-development
#9
REVIEW
Tarnveer Singh Bhamra, Brian J Tighe
PURPOSE: This review summarises the way in which mechanical property measurements combined with clinical perception have influenced the last half century of materials evolution in contact lens development. METHODS: Literature concerning the use of in-vitro testing in assessment of the mechanical behaviour of contact lenses, and the mutual deformation of the lens material and ocular tissue was examined. Tensile measurements of historic and available hydrogel lenses have been collected, in addition to manufacturer-generated figures for the moduli of commercial silicone hydrogel lenses...
November 21, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28041579/eins-zwei-drei-a-german-s-perspective-on-dry-eye-numbers-in-the-world
#10
EDITORIAL
Wolfgang Sickenberger
No abstract text is available yet for this article.
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27908604/compatibility-of-phospholipid-liposomal-spray-with-silicone-hydrogel-contact-lens-wear
#11
Michael T M Wang, Kalaivarny Ganesalingam, Chee Seang Loh, Trisha Alberquerque, Suhaila Al-Kanani, Stuti L Misra, Jennifer P Craig
PURPOSE: To assess the effects of two weeks of regular phospholipid liposomal spray application on lipid layer grade, tear film stability, subjective comfort, visual acuity, and lipid deposition in silicone hydrogel contact lens wearers. METHODS: Thirty-one existing contact lens wearers were enrolled and fitted with two week planned replacement silicone hydrogel contact lenses (Acuvue(®) Oasys(®)) in a prospective, randomized, paired-eye, investigator-masked trial...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27884617/trans-advanced-surface-laser-ablation-transprk-outcomes-using-smartpulsetechnology
#12
Ioannis M Aslanides, George D Kymionis
PURPOSE: To evaluate early visual rehabilitation, post-operative pain, epithelial healing and haze after transepithelial photorefractive keratectomy (TransPRK) using the SmartPulseTechnology (SPT) of Schwind Amaris (Schwind eye-tech-solutions GmbH, Kleinostheim, Germany). METHODS: This was a retrospective comparative evaluation of a cohort of myopic patients undergoing TransPRK with SPT (group 1), with one matched control group that underwent conventional TransPRK (group 2)...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27876528/the-impact-of-lens-care-solutions-on-corneal-epithelial-changes-during-daily-silicone-hydrogel-contact-lens-wear-as-measured-by-in-vivo-confocal-microscopy
#13
Xiaolin Zhang, Christine Marchetti, Jessica Lee, Yan Sun, Sara Debanne, Ying Jiang, Jami Kern, Mark Harrod, Beth Ann Benetz, Eric Pearlman, Loretta Szczotka-Flynn
PURPOSE: To assess corneal epithelial microstructure via confocal microscopy and determine if cellular changes are associated with lens care solutions during daily wear of silicone hydrogel contact lenses. METHODS: Corneal in vivo confocal microscopy with the Nidek ConfoScan4 was performed at baseline and after 5 months of lotrafilcon A daily contact lens wear. Enrolled participants were randomized to use either a polyhexamethylene biguanide (PHMB) preserved multipurpose care solution (MPS) or a peroxide based solution system...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27863894/precise-measurement-of-scleral-radius-using-anterior-eye-profilometry
#14
Danilo A Jesus, Renata Kedzia, D Robert Iskander
PURPOSE: To develop a new and precise methodology to measure the scleral radius based on anterior eye surface. METHODS: Eye Surface Profiler (ESP, Eaglet-Eye, Netherlands) was used to acquire the anterior eye surface of 23 emmetropic subjects aged 28.1±6.6years (mean±standard deviation) ranging from 20 to 45. Scleral radius was obtained based on the approximation of the topographical scleral data to a sphere using least squares fitting and considering the axial length as a reference point...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
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/27802912/systematic-review-comparing-penetrating-keratoplasty-and-deep-anterior-lamellar-keratoplasty-for-management-of-keratoconus
#16
REVIEW
Christin Henein, Mayank A Nanavaty
AIM: Perception of reduced incidence of graft rejection after deep anterior lamellar keratoplasty (DALK) has attracted many surgeons towards this technique in keratoconus. This review aims to compare the visual, refractive and graft outcomes after penetrating keratoplasty (PK) and DALK for keratoconus. METHODS: Electronic searches of PubMed, MEDLINE, EMBASE, Latin American and Caribbean Health Sciences Literature database (LILACS), metaRegister of Controlled Trials (mRCT), ClinicalTrial...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27693238/synthesis-and-characterization-of-nanosilver-silicone-hydrogel-composites-for-inhibition-of-bacteria-growth
#17
F M Helaly, S M El-Sawy, A I Hashem, A A Khattab, R M Mourad
PURPOSE: Nanosilver-silicone hydrogel (NAgSiH) composites for contact lenses were synthesized to asses the antimicrobial effects. METHODS: Silicone hydrogel (SiH) films were synthesized followed by impregnation in silver nitrate solutions (10, 20, 30, 40, 60, 80ppm) and in-situ chemical reduction of silver ions using sodium borohydride (NaBH4). The silver nano particles (AgNPS) were identified by UV-vis absorption spectroscopy, Energy-dispersive X-ray spectroscopy (EDX) mapping and EDX spectrum...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27671981/health-beliefs-affect-the-correct-replacement-of-daily-disposable-contact-lenses-predicting-compliance-with-the-health-belief-model-and-the-theory-of-planned-behaviour
#18
Stefano Livi, Fabrizio Zeri, Rossella Baroni
PURPOSE: To assess the compliance of Daily Disposable Contact Lenses (DDCLs) wearers with replacing lenses at a manufacturer-recommended replacement frequency. To evaluate the ability of two different Health Behavioural Theories (HBT), The Health Belief Model (HBM) and The Theory of Planned Behaviour (TPB), in predicting compliance. METHOD: A multi-centre survey was conducted using a questionnaire completed anonymously by contact lens wearers during the purchase of DDCLs...
February 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27863717/finding-routes-towards-understanding-and-the-successful-correction-of-presbyopia
#19
EDITORIAL
Fabrizio Zeri, Shehzad Naroo
No abstract text is available yet for this article.
December 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27507732/survey-of-eye-practitioners-preference-of-diagnostic-tests-and-treatment-modalities-for-dry-eye-in-ghana
#20
Kofi Asiedu, Samuel Kyei, Benedict Ayobi, Frank Okyere Agyemang, Reynolds Kwame Ablordeppey
PURPOSE: This study sought to provide an evidence-based profile of the diagnosis, treatment and knowledge or opinions on dry eye among optometrists and ophthalmologists in Ghana. METHODS: This was a cross-sectional survey RESULTS: The responses of 162 participants are included in the analysis. The most commonly used test to diagnosed dry eye disease was tear break-up time followed by patient history. The most common symptom doctors heard from dry eye patients were burning sensation followed by foreign body sensation...
August 6, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
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