Google search suggests all softlenses are made of similar materials, and there's no medical reason that a monthly lens used for 3 months increases the risk of eye damage any more than using a 3 month lens for 3 months.
Why can't I purchase monthlies and replace them after three months, instead of purchasing the quarterly lenses (quarterlies are more expensive).
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What's the harm in using a monthly lens for 3 months?