The best way for someone to ensure if a pair of sunglasses will work for their face shape is to try them on in person, and most retailers offer try-on periods with free return shipping. But there are a few rules of thumb when considering the best options. Round faces usually work well with aviator or square-shaped sunglasses. The reverse is true for square- and oblong-shaped faces where round sunglasses fit best. People with heart-shaped features should avoid oversized styles. And people who have an oval-shaped face are in luck because most sunglasses styles will fit well. Also, be sure to consider nose shape. Dr. Young recommends sunglasses with adjustable nose pads to help get the best fit. “If you have your heart set on a plastic frame without adjustable nose pads, check if the manufacturer offers a version of the frame with an extended nose bridge area, often called ‘alternative fit.’”