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Sorry, I'm new here, but I would have bet she was talking about leaving her Essilor lab until she mentioned coffee! :o

You are correct, however the basis of the Crizal line IS the hard coat. Once the hard coat has a problem, it's only magnified in the six other "layers".

Ask your lab sales rep. If he/she cannot provide the information ask for their contact at the manufacturer or their rep. Don't be shy, if they want your business, and they do!, they will provide the...