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Refractive Index Guide
Technical Guide

REFRACTIVE
INDEX GUIDE

Complete guide to understanding refractive index values and their impact on lens thickness, weight, and optical performance for superior vision correction.

Refractive Index Technology
15
1.74
Max Index

Understanding Refractive Index

Master the science behind lens performance and make informed decisions about your vision correction

1.50

CR-39

100%
Relative Thickness
Standard thickness
1.56

Mid-Index

85%
Relative Thickness
Good balance
1.67

High-Index

70%
Relative Thickness
Significantly thinner
1.74

Ultra-Thin

55%
Relative Thickness
Ultra-thin & light