Ever since I was a kid, I have had a very high prescription for my glasses, and in a typical optometrist office, I would get charged $200+ for the frame and lenses. However, on sites like coastal.com, I could find a pair of glasses for as little as $20 shipping included. Why is there such a price disparity? Assuming that the online purchased glasses are of cheaper material, would their quality be detrimental to the health of my eyes?
>>> How are online retailers able to charge so little for eyeglasses?