In most cases, if you bought an optical frame online, you can have prescription lenses inserted. Your local optical store will usually make Rx lenses for you even if you did NOT buy the frame from them. It's a good idea to contact them first before going there to see if they will do this for you.
You may also have an online optical make the lenses for you. You would need a current eyeglass prescription and your pupillary distance (P.D.) measurement. Your prescription can also be taken from a current pair of glasses. Glazzers.com can have lenses inserted for you