The right frame does not fight your face, it balances it. Here is the short version.
Round face
Angular frames add definition. Square and rectangle shapes work; avoid small round lenses.
Square face
Soften a strong jaw with round, oval or cat-eye frames. Curved edges do the work.
Oval face
Most shapes suit you. Match lens width roughly to the widest part of your face.
Heart-shaped face
Wider at the brow, narrower at the chin. Aviators and bottom-heavy frames rebalance it.
Frame measurements are listed on every product page, and our size guide explains the numbers.