I know this has been discussed and that heat will cause ar coating to craze due to lens expansion, however I have a customer who is really concerned about his new glasses which have 1.67 lenses with -2.50 cylinder and Teflon ar on them because they were adjusted by another store and placed in hot water to bend the bridge. Now the lenses still look fine, but he is worried about long term effects showing up, and I really didn't know what to tell him.
So my question is just that, if hi index lenses with ar on them are placed in hot water will it always cause damage even if not at first? Thanks all.
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