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

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https://read.qxmd.com/read/30995970/effects-of-scleral-lens-oxygen-transmissibility-on-corneal-thickness-a-pilot-study
#1
Bo Tan, Vivien Tse, Young Hyun Kim, Kristina Lin, Yixiu Zhou, Meng C Lin
PURPOSE: To investigate the effect of various oxygen transmissibilities (Dk/t) of scleral lenses and corneal thickness recovery time from overnight eye closure with patching on corneal edema during 5 h lens wear. METHODS: Scleral lenses (hofocon A, 15.6 mm diameter) were worn bilaterally with three different Dks (100, 140, and 160 Barrer). Central and peripheral corneal thickness (CCT and PCT) were measured using optical coherence tomography. Four subjects were randomly selected for one additional visit and asked to patch one eye before night sleeping...
April 15, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30987782/clinical-features-of-streptococcus-pyogenes-keratitis-case-series
#2
Sohani Amarasekera, Asad F Durrani, Samuel Faith, Regis P Kowalski, Vishal Jhanji
PURPOSE: To characterize the risk factors, clinical presentations, management, outcomes, and microbiological properties of Streptococcus pyogenes keratitis. METHODS: Eight culture-proven cases (eight eyes) of S. pyogenes keratitis were diagnosed and treated between 2008 and 2018 at the University of Pittsburgh Medical Center (UPMC). Medical records were available for six patients, and these were reviewed to identify demographic information, systemic and ocular history, clinical presentations, antibiotic sensitivity, treatments, and outcomes of S...
April 12, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30981662/the-influence-of-meibomian-gland-loss-on-ocular-surface-clinical-parameters
#3
Laura Rico-Del-Viejo, José Manuel Benítez-Del-Castillo, Fernando Javier Gómez-Sanz, María García-Montero, Clara Llorens-Quintana, David Madrid-Costa
PURPOSE: To assess the relationship between the meibomian gland loss (MGL) and relevant ocular surface clinical parameters as well as the influence of age in this relationship. METHODS: A total of 161 participants (mean age; 42±17 years) were enrolled in this study. Infrared meibography was performed using Keratograph 5M (K5M; Oculus GmbH, Wetzlar). Participants were divided into five groups according to total meiboscore and the ocular surface parameters of each MGL group were studied...
April 10, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30981661/a-topographical-method-to-quantify-scleral-contact-lens-decentration
#4
Stephen J Vincent, Michael J Collins
PURPOSE: To describe a simple method to quantify scleral contact lens decentration using over-topography captured with a Placido ring videokeratoscope, and its repeatability. METHODS: Scleral lens over-topography (E300 videokeratoscope, Medmont) was measured on 10 healthy participants following 15 min of lens settling (16.5 mm total diameter ICD miniscleral, Capricornia). Horizontal and vertical lens decentration was quantified from the translation of the front optic zone relative to the pupil centre derived from ellipses manually fitted to tangential power over-topography maps using both a standard and normalised dioptric scale...
April 10, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30981660/colonization-of-therapeutic-contact-lens-by-dematiaceous-fungi
#5
Naveen Radhakrishnan, Arun Kumar Panigrahi, Ashwin Balasubramanium, Manoranjan Das, N Venkatesh Prajna
PURPOSE: To report 2 patients with colonization of therapeutic contact lens with dematiaceous fungi. METHODS: Case report. RESULTS: The first patient had a retained soft contact lens on an opaque cornea for 4 years with brownish black multiple colonies on the soft contact lens and culture grew Bipolaris spp. The second patient was on therapeutic contact lens for pseudophakic bullous keratopathy for 4 months and developed a brownish colonization of contact lens with unidentified dematiaceous fungi...
April 10, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30967331/corneal-surface-wettability-and-tear-film-stability-before-and-after-scleral-lens-wear
#6
Maria Serramito, Ana Privado-Aroco, Laura Batres, Gonzalo Carracedo G
PURPOSE: The aim of this study was to evaluate the anterior surface of scleral contact lens and ocular surface wettability before and after one-month of scleral lens wear in patients with keratoconus. METHODS: Forty-nine patients with keratoconus (36.26 ± 9.03 years) were recruited. The sample was divided into two groups: patients with intrastromal corneal ring (KCICRS group) and patients without ICRS (KC group). TFSQ, Schirmer I test, Ocular Surface Disease Index (OSDI questionnaire), tear break-up time (TBUT) and corneal staining were evaluated in two different visits: Baseline (before lens wear) and one-month visit (10 min after lens removal)...
April 6, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30954378/quantification-of-contact-lens-wettability-after-prolonged-visual-device-use-under-low-humidity-conditions
#7
Michel Guillon, Trisha Patel, Kishan Patel, Ruchi Gupta, Cecile A Maissa
PURPOSE: Discomfort of silicone hydrogel (SiHy) contact lenses (CL) is associated with longer wearing time, demanding visual tasks, and dry environments. This study investigated the impact of challenging environmental conditions on thewettability of four daily disposable SiHy CL. METHODS: Habitual wearers of delefilcon A (n=32) and somofilcon A (n=32) were tested with their habitual lenses and with stenfilcon A and narafilcon A lenses. Digital videos were captured using non-invasive Tearscope illumination after 3 hrs of conventional wear and 3 hrs of computer use at 20% relative humidity (RH)...
April 3, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30948195/toxicity-of-therapeutic-contact-lenses-based-on-bacterial-cellulose-with-coatings-to-provide-transparency
#8
Fernanda Coelho, Guilherme Vinícius do Vale Braido, Maurício Cavicchioli, Larissa Souza Mendes, Sybele Saska Specian, Leonardo Pereira Franchi, Sidney José Lima Ribeiro, Younés Messaddeq, Raquel Mantuaneli Scarel-Caminaga, Ticiana Sidorenko O Capote
Therapeutic contact lenses were developed from bacterial cellulose (BC) by the Institute of Chemistry at Brazil's São Paulo State University (UNESP). In a previous study, cyclodextrins (CD) and medications such as ciprofloxacin (CP) and diclofenac sodium (DS) were incorporated into the lenses to provide therapeutic properties and control drug release. However, significant opacity was seen in the material inherent to cellulose. In order to achieve full material transparency, the lenses were coated with an organic-inorganic hybrid compound containing aluminum alkoxide and glycidoxypropyltrimethoxysilane (GPTS)(H), or chitosan (Q) nanoparticles...
April 1, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30922551/evaluation-of-dry-eye-disase-and-meibomian-gland-dysfunction-with-meibography-in-seborrheic-dermatitis
#9
Erdogan Yasar, Funda Kemeriz, Ugur Gurlevik
PURPOSE: To evaluate the dry eye disase and meibomian gland dysfunction with meibography of Seborrheic Dermatit patients. METHODS: A hundred-ten of 50 patients with Seborrheic Dermatitis (group 1) and 100 eyes of 50 healthy individuals (group 2) were enrolled in this prospective study. All subjects were performed a comprehensive ophthalmic examination including lid margin alterations and meibomian gland obstruction assessment, Ocular Surface Disease Index assessment, tear film break-up time test, corneal and conjunctival fluorescein staining assessment, Schirmer test...
March 25, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30910277/orthokeratology-lens-for-management-of-myopia-in-anisometropic-children-a-contralateral-study
#10
Yuanyuan Zhong, Li Ke, Wu Qiong, Fengyang Liu
PURPOSE: To investigate the effect of overnight orthokeratology (OK) lens wear on axial growth in anisometropic children. METHODS: The study involved 17 males and 12 females with an average age of 11.4 ± 2.9 years. Cycloplegic spherical equivalent error (SER) was -0.50D to -6.00D, and anisometropia ≥1.00D. The eyes with greater myopia were assigned to the G eye group and the fellow eyes with less myopia to the L eye group. All eyes were fitted with OK lenses...
March 22, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30890306/translation-and-validation-of-the-8-item-contact-lens-dry-eye-questionnaire-cldeq-8-among-japanese-soft-contact-lens-wearers-the-j-cldeq-8
#11
Shizuka Koh, Robin Chalmers, Daijiro Kabata, Ayumi Shintani, Kohji Nishida
PURPOSE: To translate and validate a Japanese version of the 8-item Contact Lens Dry Eye Questionnaire (CLDEQ-8) among a multicenter sample of Japanese-speaking soft contact lens (SCL) wearers in Japan. METHODS: The study comprised two phases, 1) forward and backward translation of the CLDEQ-8 into Japanese, 2) cross-sectional validation of Japanese CLDEQ-8 (J-CLDEQ-8) among Japanese spherical disposable SCL wearers (daily disposable, 2 week, or monthly disposable) against their Overall Opinion of SCLs, and 3) repeatability testing in a subset of subjects...
March 16, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30890305/a-study-of-contact-lens-compliance-in-a-non-clinical-setting
#12
Erin M Rueff, Jessica Wolfe, Melissa D Bailey
PURPOSE: To evaluate soft contact lens replacement, overnight (ON) wear, and contact lens case compliance in a non-clinical sample. METHODS: Subjects (n = 297) were recruited at the Center for Science and Industry (COSI) in Columbus, Ohio. Adult (≥ 18 years) soft contact lens wearers completed a survey about contact lens replacement, ON contact lens wear, and contact lens case replacement habits. RESULTS: Two-week replacement lenses (according to the manufacturer's replacement schedule [MRS]) were most common (45...
March 16, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30878378/eye-care-professionals-perceptions-of-the-benefits-of-daily-disposable-silicone-hydrogel-contact-lenses
#13
Gary Orsborn, Kathy Dumbleton
PURPOSE: To gain a better understanding of eye care professionals' (ECPs) perceptions regarding the benefits of silicone hydrogel (SiH) daily disposable contact lenses (DDCL), particularly with respect to health, comfort and patient satisfaction. METHODS: A survey was conducted with 300 ECPs in the United States, United Kingdom and Japan during November 2017. The survey comprised 34 statements relating to SiH DDCLs, to which the ECPs provided their level of agreement using a 6 point Likert scale...
March 13, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30827719/antimicrobial-and-physicomechanical-natures-of-silver-nanoparticles-incorporated-into-silicone-hydrogel-films
#14
Reda Mourad, Fahima Helaly, Osama Darwesh, Sanaa El- Sawy
PURPOSE: The effects of silver nanoparticles (AgNPs) incorporated in silicone-hydrogel films on their physicochemical properties and microbial activity were investigated. METHODS: Silicone-hydrogel composite films (SiHCFs) were prepared by in-situ chemical reduction of silver ions added in different concentrations (0, 10, 20, 30, 40, 60, and 80 ppm) followed by ultraviolet (UV) casting. The reduction of silver ions into AgNPs was confirmed by transmission electron microscopy (TEM) and absorption spectroscopy over ultraviolet and visible (UV-vis) wavelengths...
February 28, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30824271/the-ocular-surface-status-in-individuals-having-long-term-exposure-to-ionizing-x-radiations
#15
Mohammadreza Aghamirsalim, Amir Asharlous, Hassan Hashemi, Abbasali Yekta, Amir Rakhshan, Hadi Ostadimoghaddam, Hamid Gharaee, Mehdi Khabazkhoob
PURPOSE: The present investigation was done to assess the status of tear film and corneal topography in individuals with long-term exposure to X-ray. METHOD: This historical cohort study was carried out to compare the lacrimal and corneal findings between radiographers (n = 126) and non-radiographers (n = 172). Radiographers included individuals with at least 5 years of experience in radiography while subjects in the control group had no history of exposure to X-ray...
February 26, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30824270/performance-and-predictability-of-a-new-large-diameter-contact-lens-design-in-keratoconic-corneae
#16
Fernando J Fernández-Velázquez
OBJECTIVES: To evaluate the clinical performance and predictability using corneal topography in the fitting of a new large-diameter rigid gas permeable (RGP) contact lens design in eyes with keratoconus (KCN). METHODS: This study presents a review of eyes fitted with Alexa ES lenses for nonsurgical optimisation of visual correction. Anterior steep simulated keratometry (sim-K steep), corneal diameter (HVID), the Curvature at the apex in diopters (Cc), and distance from the corneal apex to the centre of the cornea (Lc) in millimetres derived from the Cone Location and Magnitude Index (CLMI) were recorded...
February 26, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30819629/pre-contact-lens-and-pre-corneal-tear-film-kinetics
#17
Michel Guillon, Panagiotis Theodoratos, Kishan Patel, Ruchi Gupta, Trisha Patel
PURPOSE: Contact lenses (CL) insulate the corneal surface from the environment. It is possible that they influence the corneal sensory mechanism that contribute to spontaneous blinking. The study objective was to quantify the pre-CL and pre-corneal tear film kinetics (TFK) over blink period. METHODS: The study population was 202 soft CL wearers, 133 non-lens wearers. TFK were quantified via post-hoc masked analysis of HD Tearscope videos. The parameters were: Non-Invasive Break Up Time (NIBUT), Exposed Area % at initial break (EA 1st Break) and at blink (EA Blink), Interblink period (IB), Protective Index (PI) and exposure speed of surface dehydration (ES mm2/s)...
February 25, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30819628/is-there-scope-for-expanding-the-optometrist-s-scope-of-practice-in-singapore-a-survey-of-optometrists-opticians-in-singapore
#18
Pradeep Paul George, Olivia Chng Shih Yun, Kalin Siow, Nakul Saxena, Bee Hoon Heng, Josip Car, Craig Lockwood
PURPOSE: In Singapore, optometrists' roles are limited compared to their counterparts elsewhere. The purpose of the survey is to investigate optometrists' current roles, views on extended roles, self-reported primary eye care knowledge, needs for continuing professional education (CPE) and views on suitable modes for CPE. METHODS: Members of the Optometrist and Optician Board (OOB) were invited via email to take part in an anonymous online survey. The survey questions covered the following areas: current scope of practice, self-rated primary eye care knowledge, confidence in screening, co-managing minor eye conditions, CPE and referral behavior...
February 25, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30808597/atomic-force-microscopy-analysis-of-the-effect-of-plasma-treatment-on-gas-permeable-contact-lens-surface-topography
#19
Felicity R Gill, Christine Purslow, Paul J Murphy
PURPOSE: Using atomic force microscopy (AFM) to investigate anterior surface topography (AST) in worn and unworn, plasma surface-treated (PST) and untreated (UT) gas permeable (GP) lenses, and influence of surface topography on in vivo comfort. METHODS: GP lens AST evaluated with AFM in tapping mode, using an uncoated, 40 nm symmetric tip (sampling frequency: 300 kHz), at five randomised locations, over a 100μm2 area, to produce mean average roughness (Ra) and root mean square (RMS) values for each sample...
February 23, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://read.qxmd.com/read/30808596/disease-patterns-of-microbial-keratitis-in-singapore-a-retrospective-case-series
#20
Weihan Tong, David Chen, Charmaine Chai, Anna Marie Tan, Ray Manotosh
PURPOSE: To investigate the disease patterns of Microbial Keratitis(MK) in patients seen in a tertiary referral hospital, to evaluate the clinical outcomes of MK and the risk factors for poorer visual outcomes. METHODS: This is a retrospective case series of all culture-positive corneal scrapings between April 2012 and October 2016. A total of 230 patients(n = 230) were included into this study. Patient demographics, clinical information and microbiological characteristics of organisms are collected...
February 23, 2019: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
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