How accurate is the Bayer abrasion scale. I saw some stuff from Hoya that a normal old AR has about a 2 out of 12 rating. Glass has a 12. There Super Hi-Vision was like a 10 or something. It is almost as tough as glass ??? Is this scale accurate ??? Alize' only had a 5. I think Teflon was 6. Higher than Alize'. Who has thoughts on this. And also is there some type of absorbtion scale for water ???