Buying prescription glasses online: What they don't tell you
I've bought eyeglasses online many times with no problems, saving big $$. Eyeglass frames and lenses are way overpriced from local shops.
One thing to note is that you need your pupillary distance measurement (PD), the distance between your pupils.
This is difficult to get as your ophthalmologist or local optician will often refuse to supply it since they also sell eyeglasses and know you will go online and cut them out.