When choosing glasses for round faces, the goal should be to add contrast to the face's natural curves and to avoid frames that could exaggerate the roundness of the face. By adding contrast, you can make a round face appear thinner and longer.
A good rule of thumb for people with round faces is to choose glasses that are wider than they are tall, as wider frames give the illusion of a slimmer face. Also, round faces should not be afraid to try glasses adorned with prints, bright colors, strong brow detailing, and other embellishments, which all add contrast and definition to the face. Finally, glasses with a clear bridge can make your eyes appear wider while adjustable nosepads can prevent frames from resting on fuller cheeks.