Canthal tilt: the angle of your eye line

What canthal tilt is

Canthal tilt is the angle of the line that joins the inner corner of your eye, next to the nose, to the outer corner, toward the temple. When the outer corner sits higher than the inner corner the tilt is positive and the eye line rises. When the corners are level the tilt is zero, and when the outer corner sits lower it is negative.

Tilt sets the direction of the eye line. People often describe a gentle upward slope as alert, a level line as calm and a downward slope as soft. Those are subjective impressions, not research findings. None of these is a flaw. They are different looks, and tilt is only one of the sixteen measures LookFlex combines.

How LookFlex measures it

LookFlex finds the inner and outer corners of both eyes on the 478-point face mesh, measures how steeply each inner-to-outer line climbs above the horizontal, and averages the two eyes. Before measuring, the face is rotated so the line between your pupils is level and corrected for head turn and nod when the 3D fit is reliable, so a tilted head does not change the answer.

The result is in degrees and signed: a plus sign means the outer corner is higher. The mesh places the corners slightly inside the visible corners, which flattens the measured angle by roughly two degrees compared with a protractor held on a photo. That is why LookFlex's ranges are set in its own units rather than copied from textbook figures.

The calculation: tilt = angle of the line from inner eye corner to outer eye corner above horizontal, averaged over both eyes.

Landmarks used

LookFlex reads these points from the 478-landmark face mesh. The numbers are each point's index in that mesh.

• Inner eye corners: 133, 362
• Outer eye corners: 33, 263
• Pupil centres (used for the level reference): 468, 473

The full pipeline, including how pose and mirror-averaging reduce noise, is on how LookFlex measures your face.

Typical and scoring ranges

LookFlex shows two ranges. The typical range is the middle half of its reference set, from the 25th to the 75th percentile: half of the faces fell inside it. The scoring range is where a reading earns a closeness score of 100; outside it the score falls smoothly, with no cliff at the edge. Both differ for men and women, and LookFlex blends the two if you choose Other or prefer not to say. Unit: degrees (signed: plus means the outer corner is higher).

How to read your result

"The range" here means the scoring range. The impressions below are common styling descriptions, not research findings. What research does show is in the next section.

• Below the range: A near-level or slightly downward eye line. It reads calm and steady. Brow shape and eye makeup can add visual lift if you want it.
• Inside the range: A gentle upward tilt that sits inside LookFlex's scoring range for your sex.
• Above the range: A pronounced upward tilt. It reads distinctive and lifted, and it is a style of face rather than something to correct.

What the research says

Limited evidence Only a few small studies touch eye tilt, so there is no research basis for an ideal angle.

• In one small photo-editing study, female faces with an exaggerated upward eye-corner tilt were usually preferred. It does not establish an ideal tilt for anyone (Bashour & Geist, 2007).
• A study of 42 celebrities found the women's eyes tilted more upward than the men's, in a small, non-diverse sample (Liu et al., 2023).
• Because the evidence is this thin, LookFlex's range is a styling convention, not a scientific optimum.

No study we cite tests LookFlex's own ranges. They come from the calibration described on the methodology page, and every source is listed under References below.

What influences it

Mostly fixed

• The shape of the eye socket and of the tissue that anchors the outer corner, which are largely inherited.
• Age, which can change the soft tissue around the outer corner.

Things that move the reading

• Brow shape. A rising brow tail can make the whole eye line look more lifted.
• Eye makeup. Liner or lash direction at the outer corner changes where the eye appears to end.
• Expression. Smiling broadly or squinting pushes the cheek up into the outer corner and moves the landmark.
• Sleep and puffiness. After sleep loss, eyes looked more swollen (Sundelin et al., 2013), and swollen lids can hide the corners and blur the angle.

How to improve how it reads

These suggestions change how the measurement reads or how well the photo captures it. Styling tips are common practice rather than tested in research, and none of them promises a change in bone structure.

• Keep the tail of each brow angled up. Tidy stray hairs underneath the tail and avoid over-plucking the outer end.
• If you wear makeup, a thin line that extends slightly up from the outer corner lifts the eye line visually. Keep it subtle.
• Look straight into the lens with a relaxed face when you scan. A broad smile or a squint changes the corner position.
• Protect your sleep: after sleep loss, faces looked as though they had droopier eyelids and more swollen eyes (Sundelin et al., 2013).
• We found no evidence that habits change skeletal tilt. Everything above changes how it reads, not the structure.

Common myths

Myth: A negative tilt means you look unattractive.

Level and slightly downward eye lines are common, and attractiveness depends on the whole face, expression and context. LookFlex's range leans positive because styling convention leans that way. The research behind it is thin: one small photo-editing study found female faces with an exaggerated upward tilt were usually preferred (Bashour & Geist, 2007). A lean is not a law.

Myth: Eye exercises, tape or gadgets can change your tilt.

We found no reliable evidence that anything you do at home moves the structures that set tilt. Eyelid tape can change the lid fold, not the corner.

Myth: Tilt reveals personality.

Tilt is geometry. Judgments of character from faces are fast and widely shared but often inaccurate (Todorov et al., 2015), and LookFlex does not make them.

How it feeds your score

This measurement is one input to one sub-score, which then combine into your Glow Score:

• Eyes: 30% of the sub-score. Eyes carries 17% of the Glow Score.

Precision. Every reading of this measurement comes with a 95% margin, estimated by measuring your photo three times. Across the reference set the median margin was ±0.74°: a retake in similar conditions usually lands within that much of the first reading. A change between two scans counts as real only when it is bigger than both scans' margins combined.

Confidence. LookFlex starts this measurement at a confidence of 85% and lowers it when your head angle, the lighting or image quality weakens the reading. The weight of each input in a sub-score scales with its confidence. Details are on the methodology page.