Power before coating is +2.11 sph, which is under the tolerance for +2.00 sph. But after Hard coating and multi-coating I got the power +2.13. This will make the power +2.25 on 0.25 step power checking, and it is out of tolerance also. So I am little bit doubted to give it to customer.
Is any body know that after coating(specially hard coat) the power can change...?
and the tolerance for the ophthalmic lens is for finished lens? or there is any tolerance for before surfacing?
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