I find that Zeiss Carat Advantage and Crizal Alize are wonderful at first but a year down the line they are much harder to clean and get dirty much faster. I am truly impressed with the Crizal Avance, never have I seen an AR clean as easily and stay clean as long. So far it doesn't seem to wear off.
But, it's not VSP approved. :( We do a lot of VSP. How can I sell it to my VSP patients without jumping through hoops with VSP? Of course I know I will have to charge more...but for some patients that isn't an issue.