So I had a patient coming back to me regarding her new 1.6 + sapphire coating (took nearly 2 weeks for those lenses). I remember clearly that the day I received the lenses I checked for every possible problems, and I couldn't find anything. Today, she came back to me with Newton's rings in the middle of both lenses (only in the middle though). They were only visible under a certain angle with certain amount of light, normally they cannot be seen. I'm not sure what might cause this. I suspect that the glasses have been exposed to some certain degree of heat, but she couldn't think of anything (she was certain she didn't wear them while blow drying, but she stated that she used antibacterial soap and room temperature/cool water). I haven't heard anything about antibacterial soap causing this effect on any AR coatings, so the reason can't be that. Does anyone have any idea what might cause these rings? In the end, I remade her lenses even though they do not really affect her vision nor the AR's performance, mainly for cosmetic purposes. But still, the question is still there. What do you think?
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