What are the differences with the Teflon, Zeiss Carat Advantage, and Crizal Alize with Clear Guard? I know Teflon have a blue ar coating and crizal comes with green what about zeiss? And is the Crizal Alize Clear Guard only used for progressives or can it be serviced for SV also? Any opticians or optometrists experience with any of these coatings? Thanks.
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