We are currently having a debate on edge thickness for nylor mounts but mostly drill mounts. We have a policy that if the Rx is +3.00 to -3.00 the required material is Trivex, beyond this range a Hi-Index can be used. Polycarbonate we try to stay away from. The retail would like the final product to have the thinness edge thickness even if it means drilling a stock lens. The lab would like to produce a product that will not chip or crack so they have imposed a minimum edge thickness on all drills and nylor mounts. Do you have a required edge thickness for drills and do you have a different requirement for plus lenses versus minus? If so, what is it?
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