I have had 3 different occasions where poly/trivex saved my pt.s eye and 5 instances where cr-39 was the actual cause of the vision loss. Gratefully on the cr-39 cases they were all adult and had signed a waiver that stated they understood that I had recommended a MORE (key word) impact resistant lens for their particular application. I my self have had an eye injury due to chipping plastic in a sunglass frame. Gratefully I did not lose my vision, it did partially penetrate my scelera (which is oddly cool and gross at the same time.) but I have not ordered cr-39 since.
I try to sell trivex to most of my patients unless they need a super thin lens, then I jump to 1.67 or higher.
I hate selling poly, and generally only sell it if the pt.s insurance covers it and they don't want to pay the upgrade to trivex. On that note I price my sv ply and trivex the same.
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