If you put 2 lenses on a table, same index,thickness,coatings and rx, say 1 is a physio 360, 1 is an ipseo. The markings are not visible or at least the lens is not marked with the usual indicators, could you tell them apart? You may use any optical lab equipment at your disposal. Substitute ipseo or physio for any 2 similarly produced lenses (say 2 different backside "hd" lenses).
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