I have a company buying 1.56 Semi finished Photochromic w/ front surface AR. After they surface the lenses they apply a UV curable hard coat to the back surface. The cure time is 7 - 10 seconds. After the curing they find spider web cracks in the AR coating. They do not have this problem with any other Semi finished lens product that has front AR.
Any explanations and advice would be appreciated.
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