Source: Mashable, Sep 2013
A 2011 study reveals that, while 28% of people consult the Internet to make decisions about eyewear, in 2014 4% of prescription glasses will be purchased outside a traditional setting (up from 1.7% in 2007). The study also found that of 154 pairs of glasses ordered online, nearly half did not meet the requirements, either optically or physically, of the buyer.
Consider that glasses are a hybrid fashion accessory-medical device. They nearly always require a two-step process: choosing frames, then getting prescription lenses. Over time, the flexibility of an online portal in comparison to running physical errands just might win.