Choosing eyewear for a triangle face comes down to one question: does the frame's shape work with or against the face's existing lines? Also called a pear shape, a triangle face is narrow through the forehead and temples and widens progressively down through the cheekbones to a broad jawline — the inverse of a heart shape. The jaw is typically the single widest measurement on the face. Rectangle Frames — straight top and bottom edges, sharp corners, wider than they are tall. — interacts with that geometry in a specific, predictable way.
The Visual Effect
The visual effect: Adds strong horizontal lines and defined angles to the face. On a triangle face, where the narrowest of the three width points and the face's widest point, often strong or square, this effect either corrects an imbalance or reinforces the face's existing character, depending on which measurement the frame emphasizes.
Why This Pairing Works
Why this pairing makes sense: Add width and volume at the forehead and temples while keeping the jaw area closer to the head, which brings the upper and lower face into better visual balance without hiding the jawline entirely. Frames that are faces that benefit from added structure and horizontal width are the ones worth trying first on a triangle face; frames that are faces that already have strong horizontal width or sharp corners are worth trying on, but expect a less flattering result without careful sizing.
Sizing It Correctly
Sizing it correctly: The frame width should roughly match your face's widest measurement — for a triangle face that's the cheekbones area. Frames noticeably narrower than that measurement will look pinched; frames noticeably wider will overwhelm the face rather than balancing it.