I have some knowdledge on formulating hardcoats chemically and have no idea about the vacuum coated.
All the testing is for the birds because hardcoat can be made nearly as hard as a diamond.
However if the substrate is soft a really hard coat might just not flex along and is not perfect. CR39 is much harder than poly so the need different grades of hardness. Thin lenses can flex and the coating can craze.
I am wearing a "Radio Jubilee" watch for the last 15 years and it is on my wrist 24 hours per day and still does not show one minor scratch. This prooves that it can be done and could be done 15 years ago, which is a long time in this age of technology.
Totally unscratchable and the new one ones are made with ceramic cases and wristbands. Has anybody seen frames made with the new ceramics. Indestructible. unscratchable, expensive but ever lasting in brand new shape.
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