MICROBIOLOGICAL CONTAMINATION OF CONTACT LENSES AND LENS ACCESSORIES IN CONTACT LENS WEARERS IN HONG KONG

Title MICROBIOLOGICAL CONTAMINATION OF CONTACT LENSES AND LENS ACCESSORIES IN CONTACT LENS WEARERS IN HONG KONG
Author, Co-Author Alice Yung, Pauline Cho Wong, Boost Maureen, Maurice K. Yap
Topic
Year
2004
Day
Program Number
Room
Affiliation
The Hong Kong Polytechnic University, School of Optometry
Abstract PURPOSE: To identify viable microbial contamination associated with contact lenses, lens cases and lens care solutions used by asymptomatic contact lens wearers in Hong Kong.

METHODS: Eighty experienced soft contact lens wearers were recruited in this study. All were using biweekly, monthly or conventional wear modalities. Upon removal, the lenses were vortexed in a transfer medium and lens cases were vortexed with the case chamber filled with the transfer medium. After treatment, the transfer medium and lens care solutions were inoculated onto agar plates. All organisms grown were isolated and identified using standard techniques.

RESULTS: Microorganisms were found on the contact lenses, lens cases or lens care solutions of 43% (34) of our group of contact lens wearers. All contaminations was caused by bacteria and no fungi were found. Thirty-nine percent (31) of lens cases; 18% (14) of lens care solutions and 10% (8) of contact lenses were contaminated. Serratia, CNS , Acinetobacter and Pseudomonas were the most common microorganisms isolated. Twenty-two contact lens wearers had more than one contaminated item (e.g. contact lenses and lens cases). In some cases, the same microorganisms was isolated from two items used by the subject; suggesting cross-contamination had occurred.

CONCLUSIONS: The contamination rate found in this study were similar to those reported elsewhere (e.g. England, Scotland and The United States). Contact lens cases showed the highest rate of contamination.

ADDITIONAL COMMENTS: This project is funded by Teaching Company Scheme: A collaborative project between The Hong Kong Polytechnic University and Johnson & Johonson (HK)Ltd.
Affiliation of Co-Authors The Hong Kong Polytechnic University, School of Optometry, The Hong Kong Polytechnic University, School of Optometry, The Hong Kong Polytechnic University, School of Optometry
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