The frame that you choose should be in proportion to your face - meaning that smaller frames look best on a smaller face and larger frames on a larger face. In general, the frame shape should be the opposite of the shape of your face.
The Oval Face
An oval face has balanced features with high cheekbones and a chin that's slightly more narrow than the forehead. Almost any style works for this face. Square-shaped frames with softly rounded edges are best for this face.
The Round Face
This face is just that - round and full with few angles. The width and length are equal. Select a style that makes the face appear longer. A wide frame with an angular rectangular style is your best bet.
The Diamond Face
Diamond-shaped faces have a narrow forehead and jawline with wider cheekbones. The width and length of the face are equal. Oval or gently curved, square, rimless glasses will soften the contour of the face.
The Square Face
A square face has a strong jawline with a broad forehead. The width and length of the face are equal. Classic oval frames are a perfect choice to soften the angles of the face.
The Oblong Face
The oblong face is longer than it is wide. The jawline is usually the widest part of the face. Select a design that will shorten the face to give a more balanced look. Round or square frames are an excellent choice.
The Triangle or Heart-Shaped Face
This face has a wider jawline and a narrow forehead. You can soften the lower portion of the face by accenting the eyes with frames that are wider at the bottom like aviator or butterfly glasses.