The Best Sunglasses If You Have A Round Face Shape
If you have a rounded face shape with wider, prominent cheekbones and more narrow jaw and forehead, you may want to steer clear of sunglasses that have round or circular frames or colored lenses, as both of these can accentuate and exaggerate the look of fullness (via Oprah). While there's nothing at all wrong with a fuller face, choosing a different style of frame and more uniform or darker lenses can help give more balance to your look.
So instead of Harry Potter-shaped glasses or pink lenses, consider instead reaching for wide, rectangular-shaped frames. The width of the frames, especially when they appear a bit wider than your face, will slim the width of your face a bit, and the rectangular frames lend the look of more structure. Further, the darker lenses give the illusion that a larger portion of your face is being covered than if you had translucent colored lenses, which helps to shift the focus of the viewer.