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Study finds contamination of contact lens cases may be due to disinfecting solution formulation
Optom Vis Sci. 2010;87(7):456-464.
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Different disinfecting solutions used during storage of silicone hydrogel lenses result in different levels and types of contamination, a study showed.
The study examined 232 participants wearing one or more of three silicone hydrogel lenses and using one or more of four contact lens solutions. At one month follow-up, between 76% and 92% of all cases were contaminated. Researchers found use of different contact lenses did not affect the contamination rate or the types of microbes.
Of the four lens solutions, AQuify and ClearCare (both CIBA Vision) were the most commonly contaminated (92% and 81%, respectively), while Opti-Free Express (Alcon) was the least commonly contaminated (76%). In addition, Opti-Free Express had significantly fewer microbes on average contaminating a case compared with Opti-Free RepleniSH (Alcon), driven mostly by differences in numbers of Gram-negative bacteria, according to the study.
However, researchers concluded that these contamination differences were not simply due to the types of disinfectants used, but that storage case contamination could be caused by other excipients in the lens solutions or the formulation of the solutions.
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