Regarding the index, we have the CR-39 1.499, middle index 1.56,and high index 1.60 lens. Regarding the type of lens, we have flat top, round top, curve top lens, and also the progressive lens in long corridor and short corridor. Further more we can provide all kinds of semi-finished lens. Except the normal stock power, we also can produce many kinds of RX high power and high cylinder power.