I buy sunglasses and eye glasses online from The Eye Shop at eBay.
I shop at the mall and eye wear stores to find what I like and to see the latest fashions, but the prices are too high for me, so I buy frames online and take them in to have the prescription filled. On my recent shopping excursion, I found stores cut back on buying so choices were few. This makes buying online more appealing.
When I buy anything online I research the business or seller and read reviews and feedback.