Glasses for a triangle face: put the weight on top

The short answer

For a triangle face, choose browline frames or any frame with a bold top: a heavy upper rim, a darker top edge, or detail along the brow line. A triangle face is wider at the jaw than at the forehead, and a strong top line adds width and weight to the upper face so the two balance. Avoid bottom-heavy frames, which add weight low down, where the face is already widest.

This is the optician's balancing rule applied to where the face is widest. It is a trade convention rather than a finding from a controlled study, but the logic is easy to see: glasses sit at the brow, and the brow is where a triangle face is narrowest, so the frame is in exactly the right place to add width.

How to tell if your face is a triangle

Use a photo taken from about 1.5–2 metres, straight on, at eye level, with your hair pushed back off the forehead and glasses off.

Camera position matters a lot for this shape. A camera held low and angled up makes the jaw look wider and the forehead smaller, which can make most faces look like a triangle. A camera very close distorts too: a 2018 paper in JAMA Facial Plastic Surgery modelled the effect of distance and estimated about 30% extra apparent nose width at around 30 cm compared with an undistorted view. So judge from a level, distant photo, not a selfie from below.

Then check three things:

1. Jaw against forehead. Compare the width just below the ears with the width across the forehead at the temples. On a triangle face the jaw is clearly wider.
2. Where the face is widest. Trace the outline. If it widens as you go down from the temples and is widest around the jaw, that is the triangle pattern. If it is widest at the cheekbones and narrows at the jaw, you are closer to diamond.
3. The jaw angle. There is usually a fairly strong angle below the ear. If the jaw is wide and angular but the forehead is just as wide, you are closer to square.

A naming note: some optician charts call this a "base-down triangle", and a few use plain "triangle" for the opposite shape (wide forehead, narrow chin), which this site calls heart-shaped. If advice you read elsewhere seems backwards, that is usually why.

What suits a triangle face, and why

Browline frames

A thick top bar, often in acetate, over a thin metal lower rim. The heavy upper line draws a strong horizontal across the brow and adds width to the narrow upper face, while the light lower half keeps attention away from the jaw. It is the most direct match for this shape.

Bold-top frames

Any frame where the weight sits along the top works the same way:

Width at the top

A frame about as wide as your face at the cheekbones, or slightly wider across the top edge, helps the upper face carry more width. This is one of the few shapes where a little extra frame width at the brow is an advantage rather than a risk.

What to avoid, and why

Bottom-heavy frames. A thick or dark lower rim, lenses that flare outward at the bottom, or a frame that sits low on the cheeks puts visual weight towards the lower half of the face. On a triangle face that is where the width already is, so the face reads more bottom-heavy.

Related choices that push the same way:

• Semi-rimless with the rim along the bottom ("reverse half-rim"), for the same reason.
• Teardrop aviators with a thin top, which widen towards the bottom.
• Small, narrow frames, which add nothing at the brow and leave the jaw as the dominant line.
• Rimless frames, which are neutral: they do no harm, but they do not add the width at the top that helps.

None of these is forbidden. They just work with the shape's width rather than balancing it.

Getting the size right

• Width. About as wide as the face at the cheekbones; a touch wider along the top edge is fine.
• Depth. Medium. The frame should sit up near the brows, not rest low on the cheeks.
• Bridge. The frame should sit without sliding or pinching. If it keeps slipping down, it will end up sitting low, which undoes the point of a bold top.
• Height. The top rim close to the eyebrow line, so the frame and your brows form one strong line.

Frame sizes are usually printed inside an arm, as something like 52□18 145: lens width and bridge in millimetres (on the boxed measuring system defined in ISO 8624), then arm length. Once a pair fits, those numbers make the next search faster.

What to say to the optician

"My jaw is wider than my forehead, so I want frames with the weight on top — a browline or something with a strong upper rim. Nothing bottom-heavy. Can you check they sit up near my eyebrows and don't slide down?"

Ask to compare a browline and a bold-top wayfarer side by side. If your prescription is strong, mention it; the optician can suggest a lens material that keeps the edges thin in a larger frame.

Not sure of your shape? Find it from one photo.

Colour

Darker colour along the top strengthens the effect, so a two-tone frame with a dark upper bar, or black or dark tortoiseshell acetate on top, works well. Pick the colour family by undertone: warm skin suits tortoiseshell, brown and gold; cool skin suits black, silver, navy and grey.

Sunglasses

Sunglasses that suit you follow the same frame shapes. Browline and bold-top wayfarer sunglasses are strong choices; classic teardrop aviators and frames that flare at the bottom are the ones to try with caution.

Trying them on properly

Photograph each pair from about a metre away, with the camera at eye level or very slightly above. A camera below you widens the jaw and makes every frame look less effective. Compare the photos, not the shop mirror.