Lens Types
Lens Materials
Glass - best visual acuity but not used much because of shattering.
CR39 Plastic - replaced glass with some shatter resistance but can scratch easily.
Polycarbonate - A.K.A. Featherweights are lightweight and thinner but slow down light transmission, they are used mainly for safety reasons for children.
Trivex or Phoenix - Lightweight and shatter resistant, better light transmission than poly.
High Index - (1.60 / 1.67 / 1.70 / 1.74): The higher the index the thinner the lens. Depending on your prescription and frame design choice, the lens thickness will vary. I will help you make the best visual and aesthetically appealing decision.