Recently, many of my friends buy prescription glasses at the online optical stores as the eyeglasses are much cheaper than the ones at retail stores. How can they discount glasses so much? Have you bought prescription glasses online?

Yes, I have bought two pairs of prescription glasses from the online optical store. I have checked with their online customer service on the same question and got the reply that they are the eyeglasses manufacturer theirselves and do not have the additional overhead constraints and expenses that the traditional retailer will have.