نتایج جستجو برای: silicon hydrogel contact lens

تعداد نتایج: 299052  

Journal: :international journal of preventive medicine 0
hasan razmjoo elham abdi sayna atashkadi mohamad reza akhlaghi ali reza peyman mojtaba akbari

background: silicon hydrogel bandage contact lenses are used to enhance epithelial healing, control surface-generated pain, and prevent epithelial erosions after refractive surgery. considering the importance of faster reepithelialization in preventing complications of photorefractive keratectomy (prk) and the fact that the features and specifications of these commercially-available lenses are ...

2012
Hasan Razmjoo Elham Abdi Sayna Atashkadi Akhlaghi M Reza Peyman A Reza Mojtaba Akbari

BACKGROUND Silicon hydrogel bandage contact lenses are used to enhance epithelial healing, control surface-generated pain, and prevent epithelial erosions after refractive surgery. Considering the importance of faster reepithelialization in preventing complications of photorefractive keratectomy (PRK) and the fact that the features and specifications of these commercially-available lenses are d...

Journal: :medical hypothesis, discovery and innovation ophthalmology journal 0
guzin iskeleli ceyhun arici mustafa deger bilgec cuyan demirkesen hilal serap arslan

this study compared tear function tests and cytologic changes on the conjunctival surface in asymptomatic patients wearing contact lens of different materials. included in this study were 40 eyes wearing daily wear 4 week replacement hydrogel (h) lenses, 32 eyes wearing silicone hydrogel (sih) lenses, 18 eyes wearing rigid gas-permeable (rgp) lenses, and 21 healthy eyes (no lenses) as the contr...

Journal: :Journal of optometry 2014
Andrew K C Lam Jimmy S H Tse

PURPOSE This study compared the measurements of intraocular pressure (IOP) and ocular pulse amplitude (OPA) using the Dynamic Contour Tonometry (DCT) over silicone hydrogel contact lenses of different modulus. Corneal biomechanics were also measured using the Ocular Response Analyzer (ORA). METHODS Forty-seven young (mean age 22.3 years, standard deviation 1.2 years) subjects had IOP, OPA, co...

Journal: :Optometry and vision science : official publication of the American Academy of Optometry 2005
Mariana Henriques Cláudia Sousa Madalena Lira M Elisabete Real Oliveira Rosário Oliveira Joana Azeredo

PURPOSE The purpose of this study is to compare the adhesion capabilities of the most important etiologic agents of microbial ocular infection to the recently available silicone-hydrogel lenses with those to a conventional hydrogel lens. METHODS In vitro static adhesion assays of Pseudomonas aeruginosa 10,145, Staphylococcus epidermidis 9142 (biofilm-positive), and 12,228 (biofilm-negative) t...

2017
Jorge A. Hinojosa Naiya B. Patel Meifang Zhu Danielle M. Robertson

PURPOSE Neutrophil-derived extracellular debris has been shown to accelerate bacterial biofilm formation on hydrogel and silicone hydrogel contact lens surfaces compared to lenses inoculated with bacteria alone. The purpose of this study was to evaluate the disinfection efficacy of four standard commercial contact lens cleaning regimens against neutrophil-enhanced bacterial biofilms formed on s...

2009
Jane Veys John Meyler Ian Davies

● Tear film assessment should be undertaken with minimal invasion of the structure – non-invasive techniques should be used whenever possible ● Assessment must be made both prior to and during contact lens wear. Tear film quality should be assessed both with the lens in situ and without the lens ● Use of the Tearscope in clinical practice allows a more detailed examination of the tears to be un...

Journal: :Investigative ophthalmology & visual science 2011
Lee A Hall Graeme Young James S Wolffsohn Colleen Riley

PURPOSE To evaluate the influence of peripheral ocular topography, as evaluated by optical coherence tomography (OCT), compared with traditional measures of corneal profile using keratometry and videokeratoscopy, on soft contact lens fit. METHODS Ocular surface topography was analyzed in 50 subjects aged 22.8 years (SD ±5.0) using videokeratoscopy (central keratometry, corneal height, and sha...

Journal: :Polimery w medycynie 2016
Jacek Filipecki Katarzyna Kotynia Katarzyna Filipecka

BACKGROUND Hydrogel and silicone-hydrogel polymeric materials are widely used in ophthalmology for the manufacture of contact lenses. An important aspect is the investigation of the structure of these materials. OBJECTIVES This study has been conducted in order to compare the degree of disorder and presence of free volumes in the internal structure of the polymeric soft contact lenses Omafilc...

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