Eyeglass frames complement a person's face shape when the shape of the frame is opposite to the shape of the face. Oval-shaped frames flatter heart-shaped faces, rectangular frames flatter oblong faces, angled frames complement round faces, and round frames flatter square faces. Most frame shapes complement oval-shaped faces.
Individuals with round faces have full cheeks and a face whose width is roughly the same as its length. Wide frames with sharp and pronounced angles add structure to round faces. The exact opposite holds true for square faces, which have well-defined angles. This face shape is softened by rounded frames with a width that stretches beyond the widest part of the face.
Individuals with oblong faces have a symmetrical face whose length is greater than its width. This shape is flattered by decorative or geometric eyeglass frames, which draw attention away from the length of face. In contrast, heart-shaped faces are wider at the top of the head and significantly more narrow at the chin. Eyeglass frames with a wider bottom and those with oval shapes are best for complementing heart-shaped faces.
Oval faces generally look good in all frame shapes. However, those with oval faces should avoid extreme shapes, such as significantly rounded frames.