Olga Frame + Blue Lens you have the option to add prescription RM 130 From (0 power) RM130 (index 1.56) RM180 (index 1.61 thin lens) RM230 (index 1.67 super thin lens) RM280 HOW TO CHOOSE LENS INDEX ? INDEX 1.56 (power -0.25 TO -4.00) INDEX 1.61 (power -4.25 TO -5.00) INDEX 1.67 (power -5.25 and above)