PARAMETER CHANGES IN MEDIUM AND HIGH WATER HYDROGEL CONTACT LENSES INDUCED BY IN-OFFICE MICROWAVE DISINFECTION

Title PARAMETER CHANGES IN MEDIUM AND HIGH WATER HYDROGEL CONTACT LENSES INDUCED BY IN-OFFICE MICROWAVE DISINFECTION
Author, Co-Author Joel Brown, Harue Marsden, Carl Robertson
Topic
Year
1992
Day
Sunday
Program Number
Poster 21
Room
Great Hall
Affiliation
Abstract Recently in-office microwave disinfection of hydrogel contact lenses has been shown to be effective in killing micro-organisms. Previous studies have not investigated the effects of the microwave process on the contact lens parameters. In this study we investigated the effects of microwave disinfection on medium and high water hydrogel contact lens parameters. Twenty methafilcon A (55% water) lenses were placed into separate AOSept¨[registed trademark superscript] vials with 10 ml of saline and microwaved for two min for each of ten cycles. This process was then repeated for twenty lidofilcon A (70% water) lenses. Power, overall diameter and base curve were then measured and compared to baseline data obtained prior to microwave irradiation. Statistical analysis using paired sample T-test show no significant changes in these three parameters following ten cycles of microwave disinfection of the 55% water content lenses (power; p=.084, diameter; p=0.53, base curve; p=0.36). In the 70% water content lenses there was no statistically significant change in power (p=0.03) or diameter (p=0.04). Although there is a statistically significant change in base curve (p=0.004) it appears not to be clinically significant (0.04 mm). From this we conclude that in-office microwave disinfection has no clinically significant impact on these three contact lens parameters and remains a viable means of in-office disinfection of diagnostic contact lenses.
Affiliation of Co-Authors
Outline