Dynamic wettability of pHEMA-based hydrogel contact lenses

Polymer Brushes: Synthesis Characterization Applications

The greatest water contact angle (94F) and brush thickness (23 4 nm) were obtained using s-BuLi to activate the DPE initiator and TMEDA as an additive From this homopolymer surface isoprene was polymerized to generate a PS-b-PI diblock copolymer Typically homopolymer and diblock copolymer thicknesses were no greater than 25 nm Perhaps one of the most comprehensive "living" anionic

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Precision1 Contact Lenses With Smartsurface Technology

• PRECISION1 (verofilcon A) contact lenses have a highly breathable silicone hydrogel core with 51% water content In Vitro Surface Wettability Contact lens wettability was measured in vitro using the iDDrop method to assess both initial water break-up time visualize the dynamic water break-up at the lens

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What are silicone hydrogel contacts?

Contact lenses made of silicone hydrogel can help alleviate dry eyes So if you currently experience dry eyes while wearing contacts you may want to ask your Optometrist if you are suited to wear silicone hydrogel contacts The technology behind silicone hydrogel contacts As its name indicates this type of contact lens is comprised of silicone and hydrogel materials Silicone is a chemical

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"Click" Chemistry

Improving the wettability of and reducing the protein adsorption to contact lenses may be beneficial for improving wearer comfort Herein we describe a simple "click" chemistry approach to surface functionalize poly(2-hydroxyethyl methacrylate) (pHEMA)-based contact lenses with hyaluronic acid (HA) a carbohydrate naturally contributing to the wettability of the native tear film

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Contact Lens Materials: A Materials Science Perspective

Contact lens materials are typically based on polymer- or silicone-hydrogel with additional manufacturing technologies employed to produce the final lens These processes are simply not enough to meet the increasing demands from CLs and the ever-increasing number of contact lens (CL) users

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Dynamic wettability of pHEMA‐based hydrogel contact

Standard methods of contact angle analysis include sessile drop captive bubble and Wilhelmy plate techniques however these methodologies are not particularly well suited for assessing the wettability of the surfaces of formed hydrogel contact lenses This paper describes two methodologies that are adaptations of previously described techniques The maximum adherent force method is an

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Applicability of Contact Angle Techniques Used in the

Objectives and Methods: Contact angle as a representative measure of surface wettability is often employed to interpret contact lens surface properties The literature is often contradictory and can lead to confusion This literature review is part of a series regarding the analysis of hydrogel

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Polymer Brushes: Synthesis Characterization Applications

Control experiments conducted under the same sequential grafting conditions on silicon wafers yielded 3 5 mg m–2 for each polymer and a total thickness of 7 nm Surface testing under various solvolytic conditions yielded a tunable surface that was capable of controlled wettability adhesion and

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BR9206889A

hydrogels wettability improving contact lens method Prior art date 1991-11-05 Application number BR9206889A Other languages Portuguese (pt) Inventor Yu-Chin Lai Paul L Valint Jr Original Assignee Bausch Lomb Priority date (The priority date is an assumption and is not a legal conclusion Google has not performed a legal analysis and makes no representation as to the accuracy of the date

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A Biphasic Model for Micro

Hydrogel-Based Contact Lens The stiffness and hydraulic permeability of soft contact lenses may influence its clinical performance e g on-eye movement fitting and wettability and may be related to the occurrence of complications e g lesions It is therefore important to determine these properties in the design of comfortable contact lenses Micro-indentation provides a

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Publications by Lyndon Jones

The Impact of Cosmetics on the Physical Dimension and Optical Performance of Contemporary Silicone Hydrogel Contact Lenses Eye Contact Lens 2020 46(3):166-173 [ Show Abstract] Purpose: Contact lens wearers may inadvertently expose their lenses during the lens insertion and removal process or while wearing their lenses to cosmetic products being used

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Tissue Engineering: Engineering Principles for the Design

Today many medical devices involve polymeric biomaterials (see Table 1 2) Polymers of a variety of chemistries in many shapes and forms are introduced into patients around the world each day Many of these materials are now common: catheters coatings for pacemaker leads and contact lenses

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Polymer Brushes: Synthesis Characterization Applications

Control experiments conducted under the same sequential grafting conditions on silicon wafers yielded 3 5 mg m–2 for each polymer and a total thickness of 7 nm Surface testing under various solvolytic conditions yielded a tunable surface that was capable of controlled wettability adhesion and

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Biomedical Applications of Hydrogels Handbook

Biomedical Applications of Hydrogels Handbook Editor-in-Chief  Raphael M Ottenbrite Editors Kinam Park Teruo Okano Biomedical Applications of Hydrogels Handbook Editor-in-Chief Raphael M Ottenbrite Professor Emeritus ia Commonwealth University Richmond VA USA [email protected] Editors Kinam Park Biomedical Engineering and Pharmaceutics Purdue University West Lafayette IN USA

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Dynamic wettability of pHEMA‐based hydrogel contact

Dynamic wettability of pHEMA‐based hydrogel contact lenses Dynamic wettability of pHEMA‐based hydrogel contact lenses Maldonado‐Codina Carole Efron Nathan 2006-07-01 00:00:00 Introduction The surface properties of a hydrogel contact lens will directly affect its interactions with the tear film and consequently its biocompatibility in the ocular environment

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Biomedical Applications of Hydrogels Handbook

Biomedical Applications of Hydrogels Handbook Editor-in-Chief  Raphael M Ottenbrite Editors Kinam Park Teruo Okano Biomedical Applications of Hydrogels Handbook Editor-in-Chief Raphael M Ottenbrite Professor Emeritus ia Commonwealth University Richmond VA USA [email protected] Editors Kinam Park Biomedical Engineering and Pharmaceutics Purdue University West Lafayette IN USA

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Review of Cornea Contact Lenses

4 Read ML Morgan PB Kelly JM Maldonado-Codina C Dynamic contact angle analysis of silicone hydrogel contact lenses J Biomater Appl 2010 Mar 10 [Epub ahead of print] 5 Maldonado-Codina C Morgan PB In vitro water wettability of silicone hydrogel contact lenses determined using the sessile drop and captive bubble techniques

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Dynamic wettability of pHEMA

Dynamic wettability of pHEMA-based hydrogel contact lenses By Carole Maldonado-Codina and Nathan Efron Cite BibTex Full citation Abstract Standard methods of contact angle analysis include sessile drop captive bubble and Wilhelmy plate techniques however these methodologies are not particularly well suited for assessing the wettability of the surfaces of formed hydrogel contact

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Microdynamics mechanism of D2O absorption of the

PCMW2D also found the PHEMA-based contact lens underwent two processes (I and II) during D 2 O absorption and the time regions of processes I and II are 3 4–12 4 min and 12 4–57 0 min According to 2D correlation analysis it was proved that process I has 5 steps and process II has 3 steps For process I the first step is D

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Noninvasive In Vivo Assessment of Soft Contact Lens Type

Dynamic wettability of pHEMA-based hydrogel contact lenses Ophthalmic Physiol Opt 2006 26:408–418 23 Maldonado-Codina C Morgan PB In vitro water wettability of silicone hydrogel contact lenses determined using the sessile drop and captive bubble technique J Biomed Mater Res 2007 83A:496–502 24 Santos L

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polyhydroxyethyl methacrylate

It is used as an embedding medium for microscopy as a coating for implants and prostheses for contact lenses as microspheres in adsorption research etc Top Publications Halpenny G Olmstead M Mascharak P Incorporation of a designed ruthenium nitrosyl in PolyHEMA hydrogel and light-activated delivery of NO to myoglobin

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Dynamic wettability of pHEMA

Contact us (postgraduate research) Postgraduate certificates and diplomas Online and blended learning Continuing professional development courses Open days Undergraduate open days visits and fairs Master's open days and study fairs Postgraduate research open days and study fairs Get ready for Manchester Prepare for Manchester Starting at Manchester The Manchester Experience

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Surface Modification of Intraocular Lenses

20 01 2016Therefore biomaterials modified with phospholipid analogs have the potential for use in a wide range of medical applications including soft contact lenses membranes for artificial kidneys vascular prostheses artificial joints and urological devices[88 89] All hydrophilic molecules makes the IOL surface hydrophilic leading to a better uveal biocompatibility though the hydrophilicity is

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Contact Lenses Surface Chemistry

Contact Lenses: Understanding Surface Chemistry Critical to Optimizing Design APPLICATION NOTE DISCUSSION Contact lenses are complex materials that must provide a range of physical properties in order to be effective safe and comfortable to wear These properties include: (1) high oxygen permeability in order to transmit O 2 to the cornea (2) hydrophilic surface so that a continuous tear

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Dynamic wettability of pHEMA

Dynamic wettability of pHEMA-based hydrogel contact lenses Research output: Contribution to journal › Article Authors: Carole Maldonado-Codina Nathan Efron Overview Citation formats Abstract Standard methods of contact angle analysis include sessile drop captive bubble and Wilhelmy plate techniques however these methodologies are not particularly well suited for assessing the

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