As a rule, contact lenses should not be worn when the eye is being treated with drops. The exception is when the contact lenses themselves are being used for some therapeutic purpose. Soft hydrophilic contact lenses can take up and store the preservative from some kinds of drop. The preservative benzalkonium chloride is especially liable to be absorbed onto a contact lens. When it is essential that drops are administered to a patient wearing contact lenses, it is often possible to prescribe in the form of single-dose containers that do not contain a preservative.
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