Most people still hold the idea that buying a pair of prescription eyeglasses must go to a local optical store in person, for we have to get our eyesight prescribed, pupil distance measured and then choose lenses and frames. Now we have a new way of filling eyeglasses: online! We no longer need to go to a local store in person; a computer with access to the internet can help us finish the procedure.
Most costumers do not know much about how to buy prescription glasses, so they think that it must be very complex. In fact, buying eyeglasses is very simple: get the eyesight prescription, choose suitable frames and lenses, and then combined them. The problems of buying eyeglasses in an optical store are expensive, inconvenient and with limited choices. While with the development of modern technology, net stores can also provide us this service at much lower costs!
From http://www.annaeyeglasses.com/how-to-buy-eyeglasses-online.html