Best sunglasses for a round face:

The thing to remember about selecting a frame style is that opposites are attractive, according to optician, Pete Hanlin. If you have a round face – defined by a wider forehead, rounded chin and full cheeks – like Adele, Michelle Williams, and Ginnifer Goodwin, a rectangular frame works beautifully to elongate the face and balance roundness.
Best sunglasses for an oval face:

Oval faces are very balanced (lucky you!). Genetically blessed beauties like Carey Mulligan, Kerry Washington, Julianne Moore, and Kate Middleton can really wear any style sunnies. The most important thing is to pick a pair that is sized in proportion to your face. Wayfarers, butterfly, and square styles are all super flattering!
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Best sunglasses for a heart-shaped face:

Heart-shaped faces, like Reese Witherspoon, Halle Berry, and Zooey Deschanel, tend to have a broader forehead, high cheekbones, and narrower jaw with a more pronounced chin. “The best sunglasses for heart-shaped faces will de-emphasise the angle between the forehead and chin,” explains Catherine Brock, the founder and editor of thebudgetfashionista.com. Light-coloured frames and those with exaggerated bottoms direct attention downward and add width to lower part of the face.