The main things to keep in mind when looking for the perfect sunglasses are the shape of your face and the fit of the frames.

There are five basic shape categories that most of us fall into: oval, heart, round, square, and oblong. If you don’t fit into one of these categories perfectly, that’s okay (as with any body feature, there are all kinds of variations). 

With eyewear, it’s all about understanding angles and finding balance. The key is achieving harmony between the angular and round features of both your face shape and your glasses shape. Generally, juxtapositions work well. The more angular your facial features, the rounder your glasses should be. The rounder your facial features, the more angular your glasses should be.

But don't have to follow these rules rigidly, personally I think that the round sunglasses look great too on round faces. But if you have a sqaure face, the opposite option will be better for you, that means a round sunglasses will look better on you.  

 

Oval Face Shape

  • An oval face is defined by balanced features - cheekbones that rest higher than the middle of your face and a chin that is slightly narrower than the width of your forehead.
  • Many frames will look great on you, but you may want to avoid significantly rounded frames. Because the general rule is to go for frames that are shaped the opposite of your face shape, unswept corners are the way to go. They’ll emphasize your cheekbones and make your jaw appear thinner and more angular.

 

Heart Face Shape

  • A heart-shaped face is defined by a broader forehead and narrower jawline and chin. This may appear as an upside-down triangle.
  • Because the width of your chin is narrower than the width of your forehead, you’ll need to find a shape that balances these features. In order to minimize the width at the top of your face, choose a frame that will widen the look of your face on the bottom. Oval, rounder shapes are good for heart faces, as are glasses with a broader bottom than top. This will balance the width of your temples and chin.

 

Square Face Shape

  • A square face is defined by strong, well-defined angles in the forehead, cheeks, and jawline.  Typically, your face is very angular from your cheekbones to your jawline.
  • Be sure to avoid glasses with hard lines that’ll make your face look too boxy.  A frame that is wider than the widest part of your face will help balance the proportion of a square face.  To soften the angles in your face, go for a low-profile pair of glasses.  Choosing glasses that are defined at the top will draw the eye away from your jawline.

 

Oblong Face Shape

  • If you have an oblong face size, your face is longer than it is wide.  It is typically very symmetrical, but the wrong frames can elongate the length of your face even more than you want.
  • You'll want to choose frames that are larger to break up the length of your face.  If you have a round face, you’ll want to choose darker frames that add angles, are structured, and are slim.  If you have an angular face, look for a pair of rounder frames that have more depth than width.  You’ll want to break up the long lines of your face, so geometric frames will work well for you.