Contact lenses cleaning solution warning
Posted on Wed 11th February 2009
Contact lens cleaning fluids are not strong enough to kill an infectious organism which can cause eye ulcers, says research.
Good contactlens hygiene is important in preventing infections which could lead to keratitis and damage eyesight permanently.
Lens users are supposed to disinfect them nightly in a solution which often includes the powerful chemical hydrogen peroxide.
However, scientists from the Department of Medical Parasitology in Vienna University, Austria, found that conventional solutions were having little effect on a particular bug called acanthamoeba.
This single-celled organism is resistant to eradication because it can take two forms, an active "tropozoite" and a far less active "cyst".
Most effective, they said, was a "two-step" solution containing 0.6% hydrogen peroxide.
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