I have worn gas permeable since 1973 and can never recall any problems. The one huge benefit I have experienced is the lens have stopped the deterioration of my eyesight. I can't recall the last time I had a prescription change. I believe my vision is sharper than with prescription glasses and I have no trouble wearing them 12 to 14 hrs a day. The only real time I have tired eyes is after playing water volleyball which I believe the chemicals in the water contribute to some discomfort.
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