... glasses 1.Material:CR-39 plastic & glass 2.Index:1.499,1.56,1.61,1.67,1.523,1.70 3 ... /C, H/M/C, size: 65/70/72 mm)3. BIFOCAL LENS (glasses & CR-39. round-top bifocal, flat-top bifocal, blended ... bifocal lens)4. PROGRESSIVE LENS5. POLYCARBONATE LENS6. PHOTOCHROMIC LENS reading glasses