The right frame should balance your face, not fight it. Round faces usually suit angular frames — squares and rectangles add definition — while square faces are softened by round or oval shapes. If your face is oval, you are lucky: most styles will suit you. Heart-shaped faces look great in frames that are wider at the bottom, such as wayfarers, and long faces benefit from wider, deeper frames that add width.
Fit matters just as much as shape. The frame should sit comfortably on your nose without sliding down, the temples should not press into your head, and your eyes should sit roughly in the centre of each lens. If you wear prescription lenses, keep the frame size moderate — very large frames make thick lenses heavier and more expensive.
When you are unsure, try a few styles side by side. At FrameAura you can compare classic rectangles, round frames, half-rim metal and titanium styles, and our team can help you pick the frame that suits your face and your prescription.