As my son often break or lose his prescription glasses, I would like to buy a few pairs of prescription glasses online. Do you have any good prescription glasses online stores to recommend? What should I notice when I am choosing the eyeglass frames for my son online?

I think PrescriptionGlassesOnline.net which is a professional online optical store is your best choice. They supply kids' eyeglasses starting from USD19.95. To ensure the eyeglasses frame will fit your son well, the most measurement is the total width of the frame. By selecting frame with similar measurement, it will fit your son perfectly.