I hope this has not been asked before but I searched the group and found nothing on this. I was talking to a friend of mine and he says Polycarb lenses should always be put in rimless and semi-rimless glasses. Since I started wearing glasses six months ago, I purchased two pairs of rimless specs, one with CR39 1.5 index and CR39 1.56 index, and a pair of semi-rimless CR39 with 1.5 index. Is CR39 not recommended for these types? Does it shatter to easily? I've never had an issue with CR39 and I'm pretty rough on my specs. Your help is greatly appreciated.
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