Buying prescription glasses online has many good points. For example, it can not be limited by the time and the price is cheap. Actually, I want to buy only the lenses and send the online store my frames, but I do not know if it is feasible, any suggestions?

Normally, the online optical stores can not fit lens into customer's own frame due to liability reason. However, if you could find a place to fit the lens into your frame, they can dispense the lens for you.