In any patients in whom sensitivities to ingredients are a strong possibility, the use of preservative-free care systems is strongly recommended. ALL products need to be switched to nonpreserved. Due to the hydrophilic nature of soft contact lenses, whenever these lenses are exposed to products that the patient is sensitive to, the lenses usually need to be replaced in order to solve any related problems. This is not typically true of rigid lenses (since they are not hydrophilic, they do not absorb the solution).
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