reading glasses 1.Material:CR-39 plastic & glass 2.Index:1.499,1.56, ... 1.61,1.67,1.523,1.70 3.CE & FDA certificates reading ... uncoated & A/R, size 65/70 mm)2. CR-39 LENS (index 1.499, 1.56, 1.61, 1. ... glasses & CR-39. round-top bifocal, flat-top bifocal, blended bifocal and curve bifocal lens)4. PROGRESSIVE LENS5. POLYCARBONATE LENS6. PHOTOCHROMIC LENS reading glasses ...