Architectural Balance: A Guide to Frame Geometry and Anatomy

A frame draws lines on a face. Its corners, curves and top edge either repeat the lines that are already there or work against them, and that decides whether a frame looks balanced.

The rule opticians use is contrast. The Association of Optometrists, the UK body for optometrists, puts it plainly: round glasses on a very round face accentuate the roundness, so a dispenser will often suggest angular frames instead. The same logic runs the other way for strong, square jaws.

The four Archē shapes cover the main options: Nous is rectangular with a double bridge, Iris is geometric with flat, angled edges, Kairos is round, and Pteron is an aviator. All four are rimless beta-titanium, so the lens edge is the outline.

How to find your face shape

Pull your hair back and look straight into a mirror. Compare three widths – forehead, cheekbones, jaw – and then the length of your face from hairline to chin.

• Oval: slightly longer than wide, cheekbones widest, jaw a little narrower than the forehead
• Round: about as wide as long, soft jawline, full cheeks
• Square: jaw about as wide as the forehead, strong corners at the jaw
• Heart: widest at the forehead, narrowing to a small chin
• Long (oblong): clearly longer than wide, with forehead, cheekbones and jaw of similar width

Few faces fit one type exactly. Go with the closest match, and treat the jaw and forehead widths as the deciding detail.

To see a shape on your own face, open any frame in the Archē collection and tap Virtual Try-On. It uses your camera and stores no recordings.

Oval face: most frames work

On an oval face the proportions are already even, so the frame only needs to keep them that way. Rectangular and geometric frames add a straight line against the soft curve of the jaw, which gives the face more definition.

Scale matters more than shape here. A frame narrower than the cheekbones makes the face look wider; a frame much wider makes the features look small.

NOUS OBSIDIAN

250,00 €

IRIS BRONZE

250,00 €

Round face: add corners

A round face has no corners, and a round frame repeats that. Rectangular and geometric frames add straight lines and angles, which makes the face look longer and more defined.

Nous gives the cleanest horizontal line. Iris adds angled edges at the corners of each lens. In both cases a lens that is wider than it is tall works better on a round face than a deep, tall lens.

NOUS NAVY

250,00 €

IRIS MOSS

250,00 €

Square face: add curves

A square face has a strong, straight jaw about as wide as the forehead. Curved frames offset those corners without hiding them.

Kairos is the round option. Pteron is the aviator: its teardrop lens is deeper towards the outer edge, which draws the eye down and away from the corners of the jaw.

KAIROS AMBER

250,00 €

PTERON CHARCOAL

250,00 €

Heart-shaped face: keep the top light

A heart-shaped face is widest at the forehead and narrows to the chin. Anything heavy along the top of the frame – a thick brow bar, decorative top corners – adds width where the face already has it.

Rimless frames help, because there is no rim along the top edge of the lens. The aviator's lens is deepest at the bottom, which adds visual weight to the lower half of the face. Kairos works too, as its round lens has no heavy top line.

PTERON AZURE

250,00 €

KAIROS CRYSTAL

250,00 €

Long face and long nose: the double bridge

A double bridge is a second bar across the top of the frame, above the nose bridge. It is a detail, not a shape, but it changes how the face reads. The horizontal line breaks the vertical length of a long face, so the face looks shorter.

It also helps with a long nose. The AOP notes that a long nose looks even longer when the bridge of the frame arches up and sits high between the eyebrows. The double bridge moves the strongest line to the brow and leaves the nose bridge itself low and thin. Nous is the Archē frame with a double bridge.

NOUS OBSIDIAN

250,00 €

NOUS NAVY

250,00 €

Width, bridge and the numbers on the temple

Shape decides the lines; size decides whether they sit in the right place. Most frames carry three numbers on the inside of a temple, for example 52□18-145. They follow the measuring system in ISO 8624:

• Lens width (52): the width of one lens in millimetres
• Bridge width (18): the distance between the two lenses
• Temple length (145): the length of the arm from hinge to tip

Lens width plus bridge width sets how wide the front sits on your face. The frame should be about as wide as the widest part of your face, usually at the cheekbones, and the temples should run straight back to the ears without pressing on the sides of the head. If you already own a frame that fits, compare its numbers with the frame you are considering.

On a rimless frame the nose pads carry the frame, so they need to sit evenly on both sides of the nose. Our frames have adjustable pads. An optician can bend them to fit.

Why rimless frames suit this approach

Rimless frames have no rim around the lens, so the lens edge is the outline. That keeps the frame shape clear without adding a thick line to the face. Archē frames are made from beta-titanium and weigh 16–18 g, so a larger lens or a double bridge does not make the frame heavy. Our guides on beta-titanium and frame weight explain the material and what the weight means in daily wear.

When to ignore the rules

Contrast is a starting point. A square frame on a square face makes the face look stronger, and some people want exactly that. A round frame on a round face can look deliberate if the size is right. If a frame fits well – width, bridge, temples – and you like it, that matters more than the face-shape chart.

You can compare all four shapes in the Archē collection. For care once you have chosen, see the product care guide.

Frequently asked questions