customer made lenses 1. plastic: CR39 1.499, 1.56, 1.61, 1.67, 1.74 2. mineral: ... made lenses 1. GLASS LENS (index 1.523, 1.70, uncoated & A/R, size 65/70 mm)2. CR-39 LENS (index 1.499, 1 ... .56, 1.61, uncoated, H/C, H/M/C, size: 65/70/72 mm)3. BIFOCAL LENS (glasses & CR ... .49, 1.56, 1.61. short and long corridor) glass lenses