A square face is often characterized by a strong jaw line, a broad forehead, and a wide chin and cheekbones. The width and length of the face are close to being equal. Glasses should be selected to make the face look longer and to soften the square angles of the face. Choose frames that are slightly curved (like an oval shape) and that have more horizontal than vertical real estate.
The oval face is identifiable by its balanced proportions. The forehead is slightly wider than the chin and cheekbones are high. Frames should complement the natural proportions of the oval. Choose glasses that are wide or wider than the broadest part of the face and that follow your brow line. Often, diamond or rectangular shapes work best for oval shapes.
A round or full face is characterized by having the same width and length. For round faces, frames that add length to the face often work best. Glasses that lengthen the face are typically angular, narrow and are wider than they are deep. It is best to avoid round style frames as these will exaggerate the roundness and curves of the face.
Heart Shaped Face (or Base-Up Triangle)
A heart shaped face looks like a heart or a triangle with the point facing down. The forehead is very wide and cheekbones are high while the face narrows towards the chin. Counterbalance the narrow chin by choosing frames that are wider at the bottom. Generally, light colored and rimless glasses work best, although aviator, butterfly and low-triangle styles also work well.
Base-Down Triangle Face
A diamond shaped face is often characterized by high, dramatic cheekbones with a narrow eye line and jaw line. This shape is the rarest of all the shapes. Oval frames that are soft in style typically work best to highlight the eyes and cheekbones. Select glasses that have detailing, distinctive brow lines, are rimless or a cat-eye shape for best results.