If you have found your way to this page, thank you for your interest! The advantage of Tribrid is that it combines the optical quality and light weight of Trivex with the slimness of "high index" materials to create a material that is both thin and lightweight, while also being optically superior to polycarbonate and resistant to impact. First, understand that Tribrid can be fabricated in both conventional and digital designs. However, prescriptions that derive the most benefit from the benefits of Tribrid will be the same prescriptions that benefit the most from digital or "free-form" lenses. Free-form? Free from what? "Free" from distortions of color, shape and size. (Is anything really "free"?)
"Tribrid" is one of the newest lens materials to become available for prescription ophthalmic lenses. It has some distinct advantages for many people who wear glasses but most particularly, those people with large magnitude corrections for astigmatism, myopia and hyperopia. What constitutes large magnitudes? Great question! The truth is, that it depends... For myopia and hyperopia, about 3 diopters is becoming significant and for astigmatism, cylinder corrections greater than about 2 diopters. Frame size impacts these general recommendations, as well as additional prism corrections and smaller inter-pupillary distances (PD), relative to frame size. The larger the frame size and the smaller the PD, the greater the potential benefit.
While not as resistant to impact as Trivex or poly and therefore inappropriate for safety eyewear, it is five to ten times more impact resistant than regular ophthalmic plastic or other high index lenses. Trivex has a slightly higher Abbe value. What's Abbe value?
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