You need to have one every year. If its been over a year, your doctor's office will not allow you to purchase more until you've had a new examination. Its not only to see if the prescription has changed, its also to make sure that your eyes are healthy. With wearing contacts comes a much higher incidence of infection and complications so for that reason, they need to see you every year to make sure that your eyes are healthy enough to continue wearing them...
Every year...
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