This web site is no longer actively maintained. Please visit for up to date information.
Powered by Google
This Month
Ocular Surface Characteristics of the Asian Eye
Meeting Synopsis
Academy 2010
pective Analysis of Risk Factors Associated With Contact Lens Induced Inflammatory Events During Continuous Wear
Feature Review
Adequate tear mixing under a soft contact lens may play an important role in minimizing certain > more
Tell a friend
> Home
> About Us
> Affiliates
> Contact Us
> Disclaimer
> Site Map


The Silicone Hydrogels website is partially supported through an educational grant from CIBA VISION

Posters | Archive
February 2007


Conformation of Lysozyme Deposited on Conventional and SH CLs Materials

Suwala, Maciej, Glasier M, Subbaraman N, Jones L
Centre for Contact Lens Research, University of Waterloo


PURPOSE: To determine the activity of hen egg lysozyme (HEL) deposited on conventional and silicone hydrogel (SH) contact lens materials using an in vitro model.

METHODS: Acuvue 2 (etafilcon; AV2), PureVision (balafilcon; PV), Acuvue Advance (galyfilcon; AA), Focus Night & Day (lotrafilcon A; FND), O2Optix (lotrafilcon B; O2), Proclear (omafilcon A; PC), and Acuvue OASYS (senofilcon A; AO) contact lenses were deposited in vitro in a phosphate-buffered solution (PBS) containing 2mg/ml HEL. Lenses were briefly rinsed in PBS to remove unbound material and extracted in a mixture of acetonitrile and trifluoroacetic acid. Following lyophilization, extracts were examined for lysozyme activity by micrococcal assay and total protein by Western blot.

RESULTS: In terms of total protein accumulation, AV2 showed the most, with 1800µg/lens, PC the next with 68µg/lens and FND the least, with 2µg/lens. AA, AO, and O2 accumulated similar amounts of lysozyme, at approximately 6µg/lens. Lysozyme deposited on AV2 exhibited the greatest activity (91±5%) and this was statistically different from all other lens types (p<0.001). Lysozyme deposited on FND (24±5%) and O2 (23±11%) exhibited the lowest activity. Lysozyme deposits on other lens materials exhibited intermediate activity (AA, 60±15; AO, 51±9; PV, 58±8; and PC, 38±3%).

CONCLUSIONS: Silicone hydrogels deposit lower amounts of lysozyme than either conventional FDA group II (PC) or group IV (AV2) lenses and the levels of activity of the lysozyme are highly variable between materials.

Download PDF of Poster:
Download - 131 KB
You will need Version 4 or later of Adobe Acrobat Reader to view some documents on this site. You can get the latest version from the Adobe Home site. 
All rights reserved, copyright 2002 - 2007