Tribrid 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

Tribrid 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.