Nose-to-intercanthal width ratio

The inner eye corners provide a nearby reference for the nasal wings. Vertical lines drawn down from those corners show whether the wings sit inside the eye gap or extend beyond it.

The cheekbones provide a wider comparison. A nose can extend beyond the inner-eye lines while still occupying a modest share of the face, particularly when the eyes are close together. A nose inside those lines can also be substantial within the face if the eye gap is wide.

Widening the nasal base raises the ratio while leaving the inner-eye gap unchanged. The wings extend farther to the sides, increasing the nose's horizontal presence. If nose-to-face width is also high, that breadth is visible against both the eye gap and the cheeks.

A smaller eye gap can raise the result around an otherwise moderate nasal base. The wings appear wider than the space above them because that space is narrow. Comparing the gap with eye width helps show whether close inner corners contribute to the result.

At a low ratio, the distinction reverses. A narrow nasal base can fit well inside an ordinary eye gap, while a broad gap can make a substantial base look narrow beneath it. These configurations may share a number but give different impressions of the nose's size.

Height changes the appearance of a given nasal width. A broad base beneath a short nasal region can create a compact shape, while the same breadth in a tall nose occupies more of the centre in both directions. A narrow base may belong to a small nose or to a long, slender one. Nose height-to-width separates these possibilities.

Below the nose, a wide mouth can continue the central breadth. The nasal wings may extend beyond the inner-eye lines while the mouth extends farther still, creating a gradual widening downwards. With a narrow mouth, the same nasal base becomes a more conspicuous span between the eyes and lips.

These comparisons share distances. Widening the eye gap lowers nose-to-gap while raising gap-to-eye width, even if the nose and eyes themselves stay unchanged. The results describe the same increase in space from different reference points.

The traditional equal-width canon aligns the nasal wings with the inner eye corners. Attractive-model studies have found departures from this alignment. Torsello and colleagues reported nasal widths exceeding the eye gap in their selected female models.

The 1.00–1.17 reference describes a base that matches or modestly exceeds the gap. Zheng and colleagues examined nasal length, base width and intercanthal width together, which gives context for interpreting the arrangement. Their findings do not establish these exact limits as a preferred range for every combination of nasal height and eye spacing.

Fang, Clapham and Chung documented variation in nasal breadth and interocular dimensions across populations. Reference values depend on the population sampled and the measurement method.

The nasal region and eye region also develop at different rates. As the nose grows, the base may become wider relative to the earlier-developing eye region. If both the base and gap increase proportionately, the ratio can remain stable despite growth in each.

Expression can produce a more immediate change. Nasal flare or smiling may widen the visible base while eye spacing stays similar. A relaxed frontal photograph makes the comparison easier to repeat.