Use of monthly disposable lenses may encourage less diligence in cleaning lenses. 1 7 This indicates that many commercially available lens care systems may not be adequate on their own. 7 8 Levels of microbial contamination of 10 8 cfu/ml and above are common in used contact lens cases. 6ĭaily cleaning of contact lenses is not always properly performed by lens wearers. The studies show that bacteria can survive chemical disinfection 5 and they describe resistance to hydrogen peroxide by Candida parapsilosis, a yeast associated with cutaneous infections. Studies indicate that several multipurpose solutions and peroxide systems are not able adequately to disinfect concentrations of bacteria (for example, Staphylococcus aureus) of 10 7–10 8 cfu/ml. 4Ĭontact lens wearers and eye care practitioners may rely too much upon contact lens solutions to reduce microbial contamination. 3 Physical cleaning of lenses and lens cases, helps to reduce micro-organisms before chemical disinfection. 2 A contributing factor to lens wear complication is microbial contamination, and reports suggest that up to 95% of lenses in use are contaminated. 1 Lens wearers are increasingly seen in accident and emergency departments of certain hospitals. The incidence of microbial keratitis in contact lens wear appears to be increasing and indications are that up to 30% of corneal ulcers are associated with contact lens wear.
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