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Yeah, I got that backwards. Point is that CR39 is not exactly better optically. Trivex is significantly better chromatically than PC, 1.60, ... In addition, Tri
by CalChris 9y ago
Yeah, I got that backwards. Point is that CR39 is not exactly better optically. Trivex is significantly better chromatically than PC, 1.60, ... In addition, Trivex acts as a UV cutoff filter.
What I couldn't figure out is whether a CR39 lens' comparative thickness (prism length) vs a thinner Trivex lens degrades its chromatic aberration advantage in practice.
http://eclecticeyewearaustin.com/wp-content/uploads/2016/05/Lens-thickness.jpg http://eclecticeyewearaustin.com/wp-content/uploads/2016/05/...
- boptom 9y agoGenerally, you would expect lenses with a higher refractive index to be thinner. However, due to the selling point of Trivex being "shatter proof" it has a greater centre thickness (to pass safety lens regulations), and thus the edge thickness is also comparable to CR-39.