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I made glasses at LensCrafters throughout college (super enjoyable job btw!). My main takeaway was to avoid polycarbonate lenses. People returned them often due
by city41 9y ago
I made glasses at LensCrafters throughout college (super enjoyable job btw!). My main takeaway was to avoid polycarbonate lenses. People returned them often due to headaches, and I experienced headaches myself as my safety glasses were required to be polycarbonate. Polycarbonate can be a decent compromise in some situations as the lenses will be thinner than equivalent plastic lenses.
- walterbell 9y agoWhat do you think of Trivex / Tribrid?
- CalChris 9y agoTribrid is newish (2013) and targeted for stronger prescriptions in the +/-3.00 to +/-7.00 diopters range. It's a little heavier (1.23 vs 1.11) than Trivex and slightly worse Abbe (41 vs 44) but has refractive index of 1.60 vs 1.53. http://www.visionmonday.com/article/ppg-launches-tribrid-lenses-in-north-america/ http://www.visionmonday.com/article/ppg-launches-tribrid-len... I want a tool where I can find out if a lens for my prescription is lighter in one material vs another. Trivex is lighter than Tribrid but has a lower RI. I'm at -3.
- walterbell 9y agoThis one calculates center & edge thickness: http://64.50.176.246/tools/thickness.php http://64.50.176.246/tools/thickness.php This one claims to calculate weight: http://www.glassfab.com/tools/weight-calculators/weight-of-a-lens/ http://www.glassfab.com/tools/weight-calculators/weight-of-a...