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pcray1231
Well-known member
Native Eyewear = Costa, in case anyone was wondering. Same company. The lower specd costas are the same lenses as Native. Frames are different.
Polycarbonate hasn't advanced. It's a material with a lot of aberration inherent in the crystal structure. It can't advance. There are, however, more advanced plastics like Trivex and CR-39 and a whole bunch of proprietary ones. These are generally the type of material that modern prescription glasses are made from. Like I said they all strike some balance between the optics and scratch resistance of glass and the impact resistance of poly.
And, since they are plastic, some may refer to them as polycarbonate. They are not, and should not be marketed as such either.
Regarding expense, when I bought cheap is I'd break and lose them. Funny how nice stuff seems to get taken care of better. Though my wife did break my pair of Mj's. MJ replaced them for $10. And you can replace lenses, for life, for $50ish.
Polycarbonate hasn't advanced. It's a material with a lot of aberration inherent in the crystal structure. It can't advance. There are, however, more advanced plastics like Trivex and CR-39 and a whole bunch of proprietary ones. These are generally the type of material that modern prescription glasses are made from. Like I said they all strike some balance between the optics and scratch resistance of glass and the impact resistance of poly.
And, since they are plastic, some may refer to them as polycarbonate. They are not, and should not be marketed as such either.
Regarding expense, when I bought cheap is I'd break and lose them. Funny how nice stuff seems to get taken care of better. Though my wife did break my pair of Mj's. MJ replaced them for $10. And you can replace lenses, for life, for $50ish.