Abstract
The bacterial contamination rate of contact lens cases in different care systems was investigated and a comparison was made between the case caps and the case wells. Contact lens cases were collected from 39 hydrogen peroxide care system users and 14 non-hydrogen peroxide care system users at the Southern California College of Optometry during routine follow-up care. The total contamination rate of all the case samples was found to be 19% (10/53). Fifteen percent of the cap samples (8/53) and 19% of the well samples (10/53) were found to be contaminated. Of the samples that were contaminated, 80% (8/10) were found to be contaminated in both the cap and the well and 80% were found to be positive for the Pseudomonas aeruginosa strain of bacteria. There was no difference in contamination rate between hydrogen peroxide and non-hydrogen peroxide disinfecting systems. These results indicate a lower incidence of lens case contamination than in previous investigations, but emphasize the need for regular cleaning or disinfecting of the entire contact lens case as part of routine care by contact lens patients.
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