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Lens Materials & Coatings
Lens Material Comparisons

Crown Glass
CR-39
Polycarbonate
Index of Refraction
1.523 Thinner
1.498 Thin
1.585 Thinnest
Specifc Gravity
2.55 Heavier
1.32 Lighter
1.20 Lightest
V-Value
59 Least Color Dispersion
58 More Color Dispersion
30 Most Color Dispersion
Impact Resistance
Good (When Treated)
Better
Best
Tintability
Color In Glass or Vacuum Coating or Photochromic
Virtually Unlimited
Only as Good as SR Coating
Scratch Resistance (Uncoated)
Good
Fair
Poor
Scratch Reistance
Good
Fair
Poor

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