List of Online Retailers for Prescription Eyeglasses

on 25 May 2013
One of the lenses on my five-year-old frames popped out yesterday. I know it's around the house somewhere, but it seems to be doing an excellent job of hiding. Although I don't have horrible vision, having corrected-vision makes interacting with the world so much more pleasant. 

Since I was looking at the various options for purchasing glasses online, I thought I'd post my findings here. It's a short list, but at least it saves me 30 minutes of searching the next time I need glasses. 
They all have relatively high search-rankings and were mentioned a few times on various discussion boards. I have yet to purchase anything, so I can't comment on purchase-experience or product-quality.