Consumers are often non-compliant with instructions for contact lens care products. This study explores the antimicrobial capacity of multipurpose solutions using variable use conditions. Opti-Free Express (Alcon) Multi-Purpose Disinfecting Solution with Polyquad (Alcon) and Aldox (Alcon) antimicrobial system and products containing PHMB (ReNu MultiPlus, Solo-care, and Complete multipurpose solutions) were evaluated. Products were challenged with Fusarium solani, Candida albicans, Serratia marcescens, Pseudomonas aeruginosa, and Staphylococcus aureus. The antimicrobial activity and effectiveness of regimen steps, rinse volume, stored lenses and organic soil were evaluated. The results show that products using similar regimens can show different disinfection abilities. Opti-Free Express Multi-Purpose Disinfecting Solution retained effectiveness using variable and non-compliant conditions.
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