Originally Posted by
Dr. Bill Stacy
I've used some of it, and I wouldn't call it soft. It is hard to the point of being brittle, so you have to be careful and make sure to do a nice pin bevel. I've also found that you really need to specify center or edge thicknesses AND base curves or you can get some strange lenses. The benefits of Hivex are high ABBE, very impact resistant, UV blocking, some blue blocking, and it edges like cr39. Unlike trivex, it can shatter if hit hard enough, so I tend to prefer trivex for most jobs.
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