No schedule: There is no scheduled time to replace them. If your prescription has not changed, then you don't need adjustment unless you want newer frames or lenses.
Answered 12/7/2014
6.3k views
Depends: Some people have a stable eye prescription and do not need a glasses change. Others may need new glasses when things are longer crisp or if the glasses are damaged or scratched.
Answered 11/12/2012
5.5k views
8 doctors weighed in across 2 answers
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