Heart shaped faces are characterized by an upside-down triangle appearance, in which the forehead is significantly wider than the chin. The pointed chin makes this the softest of faces.
Try frames that are thin, light metal or plastic, and slightly rounded. Oval shapes are good for heart faces, as are glasses with a broader bottom than top. This will bring balance to the width of your temples, and make the point of your chin seem less severe.
Those with an oval shape are the luckiest of all! Your face will have cheekbones higher than the middle of your face, and your chin will be a bit narrower than your forehead, though not by much. Why are you luckiest, you ask? Because most -- pretty much all -- frames will look great on you.
You might want to avoid significantly rounded frames, as the general rule is to go for the opposite of your shape. Upswept corners will emphasize your cheekbones and make your jaw appear thinner and more angular.
Round faces have full cheeks without many angles. The width and length of your face is roughly the same.
Avoid glasses with a lot of curves in them, any that mimic your face shape. Instead, go for straight, angular frames that will add more structure to your face. Darker frames are also helpful, because they draw attention to the lines of your glasses, and define your face. Finally, choose lenses that are wider than they are deep.
Square-faced individuals have a lot of angles. From your cheekbones to your jaw, your face is very defined.
To soften the angles in your face, go for a low-profile pair of glasses. "A frame that is wider than the widest part of the face helps to balance the proportion of a square face," Blumenthal tells us. A defined top of the glasses will draw the eye away from your jawline, and slim, barely there frames add delicacy.
If you're a glasses wearer, you know that the frames can completely make or break your look. We get it! They may be essential for your eyesight, but they're an accessory all the same. So choosing correctly is extremely important.
There are lots of factors to base your choice on, including your personal style and coloring (eyes, skin, hair) -- but perhaps the most universal is your face shape. There are five basic shape categories that most of us fall into. If you don't fit one perfectly, go for the one that is closest to your shape. As with any body feature, there are all kinds of variations.
For those with a square face shape, be sure to avoid glasses with hard lines that might make your face look boxy. Co-Founder and Co-CEO of Warby Parker Neil Blumenthal told us that "a frame that is wider than the widest part of the face helps to balance the proportion of a square face."
Heart-shaped faces, those with a chin much thinner than their forehead, need to find shapes that balance the width of their face. Blumenthal suggests trying to "minimize width at the top of the face" by choosing frames that widen at the bottom. Oval faces are the luckiest, as they can pull off almost any style. You may want to balance the curve of your face, so choose square, rectangle or upswept glasses to balance your face.
Oblong, or long face shapes, will see much more length than width. You'll want to choose frames that are larger, to break up the length of your face. Those with round faces will want to choose frames that add angles, are structured and slim. Lenses that are wider than they are deep, as well as those with dark frames help define a round face.
A final thought -- and all-around good advice -- Blumenthal told us that "for eyewear in general, juxtapositions work best: the more angular your features, the rounder your glasses should be and vice versa."
Click through the gallery above to see more on which glasses you should choose, and some options we've selected for each face shape!