Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/198514

Title

Clinical observations of biofouling on PEO coated silicone hydrogel contact lenses

Author(s)

Thissen, Helmut;  Gengenbach, Thomas;  du Toit, Renee;  Sweeney, Deborah F.;  Kingshott, Peter;  Griesser, Hans J.;  Meagher, Laurence

Abstract

Silicone hydrogel contact lenses, which have been a major advance in the field of vision correction, require surface modification or coatings for comfort and biocompatibility. While current coatings show adequate clinical performance, advanced coatings may improve the biocompatibility of contact lenses further by reducing biofouling and related adverse clinical events. Here, we have produced coatings on Lotrafilcon A contact lenses by deposition of a thin film of allylamine plasma polymer (ALAPP) as a reactive interlayer for the high density grafting of poly(ethylene oxide) dialdehyde (PEO(ALD)2), which had previously shown complete resistance to protein adsorption in vitro. The performance of these contact lenses was evaluated in a controlled clinical study over 6h using Focus® Night and Day™ (also known as Air Optix® Night & Day®) contact lenses as control lenses. Surface modified lenses were characterised by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) before and after wear. Clinical data showed a high level of biocompatibility of the PEO coated lenses equivalent to control lenses. Surface analysis of worn contact lenses demonstrated that the high density PEO coating is effective in reducing biofouling in vivo compared to control lenses, however small amounts of protein deposits were still detected on all worn contact lenses. This study highlights that elimination of biofouling in vivo can be much more demanding than in vitro and discusses issues that are important for the analysis of worn contact lenses as well as the design of improved contact lenses.

Publication type

Journal article

Source

Biomaterials, Vol. 31, no. 21 (Jul 2010), pp. 5510-5519

Publication year

2010

FOR Code(s)

0903 Biomedical Engineering;  0904 Chemical Engineering;  0912 Materials Engineering

Keyword(s)

AFM;  Adsorption;  Aldehydes;  Allylamine;  Atomic force microscopy;  Atomic spectroscopy;  Biocompatible coated materials;  Biocompatibility;  Biofouling;  Clinical data;  Clinical observation;  Clinical performance;  Clinical study;  Contact lenses;  Deposition;  Ethylene;  High density;  Humans;  Hydrogels;  Hydrophilic contact lenses;  In vitro study;  In vivo study;  In vivo test;  In-vitro;  In-vivo;  In-vivo tests;  Macrogol;  Material coating;  Materials testing;  Optical instruments;  Photoelectron spectroscopy;  Plasma deposition;  Plasma polymers;  Polyethylene glycols;  Polyethylene oxides;  Polymer;  Protein adsorption;  Proteins;  Silicone coatings;  Silicone hydrogels;  Silicones;  Surface analysis;  Surface modification;  Surface properties;  Surface treatment;  Surface-modified;  Visual field;  X-ray photoelectron spectroscopy;  XPS

Publisher

Elsevier

ISSN

0142-9612

Publisher URL

http://dx.doi.org/10.1016/j.biomaterials.2010.03.040

Copyright

Copyright © 2010.

Peer reviewed