When you’re ordering prescription eyeglasses online instead of through an optician, there’s a wider variety of frame styles to choose from, and you can save up to hundreds of dollars on a single pair. But buying glasses online is not the best choice for everyone.After eight years of research — including talking to nearly a dozen eye-care professionals and testing more than 50 comparable frame-and-lens pairings from 15 retailers — we recommend that you start your search at Zenni Optical.Zenni has an easy-to-browse selection of over 2,000 frames, a helpful virtual try-on tool, multiple lens options, and more-affordable pricing than competitors.