For one, they’re practical and provide great value. Today’s prescription lens technologies are highly advanced, but often require a big investment for patients.  For patients on a budget, second pair prescription sunglasses are often out of reach .  Clip-ons provide superb sun protection at a fraction of the price. Second, custom clip-ons can be fashionable as well as functional.  Patients can choose their favorite designer eyewear with the best progressive lens technology and know they can easily turn them into fashion sunglasses by adding a clip-on.
Lastly, for those who wish to have more than one style of eyewear for different occasions, patients can concentrate on picking multiple styles of eyewear without worrying about having to dedicate any to sunglass use only.  Consider custom clip-on sunglasses and effectively double your available frame options!