CanthalTilt.netMeasure yours

Eye geometry

Canthal Tilt Test — Measure Your Eye Angle

Measure the angle between your inner and outer eye corners from a front-facing photo. Your photo stays on this device.

  • Private
  • Browser-based
  • No signup
Local processingYour image stays on this device.How privacy works
PhotoAlignResult
DemoSynthetic example
Synthetic front-facing portrait with four eye-corner points, both eye axes, a face-relative horizontal, and a canthal tilt arc

+2.1°

Positive direction

Left +3.8°Right +0.3°

Method
Browser-based landmark detection
Privacy
Photos stay local
Output
Left and right eye angles
Adjustable
Correct eye-corner placement

The angle

What is canthal tilt?

Canthal tilt is the angle between two points: the inner corner of the eye and the outer corner. The angle is signed. Positive means the outer corner sits higher than the inner corner. Negative means it sits lower. Near zero, the corners are close to level.

The reference is the face, not the edge of the photo. A slight lean of the head is removed first. One front-facing photo is enough. The number describes geometry. It is not a beauty score, and it is not a target.

INNER CANTHUSOUTER CANTHUSFACE HORIZONTALEYE AXISθANGLE θ
Fig. 01 — The canthal tilt angleCanthal tilt is the signed angle between the eye-corner axis and a face-relative horizontal reference.

Direction

Positive, level, negative

Three drawings of one eye. The only change is where the outer corner sits.

Negative−6°
Near level0°
Positive+6°
Same eye, three directionsFraming, identity, and lighting stay put. Only the outer corner moves.

Method

How we measure it

We correct mild head roll before measuring each eye.

  1. 01Find the eye cornersThe inner corner sits by the nose. The outer corner sits toward the ear.
  2. 02Level the faceA small lean of the head is taken out before the angle is read.
  3. 03Measure each eyeLeft and right are read on their own, then averaged.
  4. 04Check the pointsIf a marker misses the corner, drag it into place.

See the full method →

Privacy

Your photo stays on this device.

The face model runs in the browser after you choose a photo or the camera. A standard measurement is not uploaded, stored, or used to train a model.

How privacy works

Position

Why the photo has to be level

A camera below the chin, or a head turned to the side, changes the picture. Mild roll is corrected. A large turn is rejected instead of being guessed away.

Hold the camera at eye level, look straight ahead, and keep both corners visible.

Same eye rolled 0.0° in the photo. Face-relative angle stays +4.0°. Photo-edge reading is +4.0°.
Face reference+4.0°
Photo edge+4.0°
Head roll0.0°
Fig. 03 — Why head roll mattersSame eye line. The face-relative angle stays +4.0°. The reading against the photo edge moves with the roll.

Left and right can differ

The report names your left eye and your right eye. A difference of a degree or two can be the face, the photo, or both. It is not automatically something to correct.

+4.0°Left eye
+1.0°Right eye
Fig. 04 — Left and rightThe average is a summary. The two eyes can disagree by a degree or two.

Index

Related guides

  1. 01Negative canthal tiltWhat downward eye-corner direction means
  2. 02Positive canthal tiltHow an upward eye line is measured
  3. 03Neutral canthal tiltWhy values near zero need another look
  4. 04Positive vs negativeSame eye, three directions
  5. 05How to measureFour steps from a level photo to a signed angle

What a published average is

Clinical photographs have measured this angle against a horizontal built from the facial midline.[1] A mean from one sample belongs to that sample. It is not a personal target, and this site does not rank angles. The landmarks come from MediaPipe Face Landmarker, loaded only after you start a measurement.[2]

References

  1. 01

    Diagnostic analysis of vertical orbital dystopia and canthal tilt for surgical correction

    Lee JY, Choung HW, Choung PH. Diagnostic analysis of vertical orbital dystopia and canthal tilt for surgical correction. J Korean Assoc Oral Maxillofac Surg. 2020;46(6):379-384.

    PubMed ↗
  2. 02

    Face landmark detection guide

    Google. Face landmark detection guide. MediaPipe Solutions.

    Documentation ↗

Questions

What is canthal tilt?

Canthal tilt is the angle of the line between the inner and outer corners of the eye relative to a horizontal reference.

How is canthal tilt measured?

This tool finds the inner and outer eye corners, removes head roll, and reports the angle of each eye plus the average. You can drag the four points if the automatic placement is off.

What is a positive canthal tilt?

Positive means the outer corner sits higher than the inner corner. It describes direction, not attractiveness.

What is a negative canthal tilt?

Negative means the outer corner sits lower than the inner corner. It is a geometric description, not a verdict.

Can head angle affect the result?

Yes. Looking up, down, or sideways changes the photo. Mild head roll is corrected. Large yaw or pitch is rejected so the tool does not invent a precise number.

Can the left and right eyes differ?

Yes. The report lists your left eye, your right eye, and the difference between them.

Is canthal tilt the same as eye shape?

No. Canthal tilt is one angle. Eye shape also includes eyelid exposure, spacing, and the outline of the opening. Those are separate measurements.