Harmony & facial ratios
Lateral Canthal Tilt
1 min read · Updated October 4, 2026
The angle of the line from the inner to the outer corner of each eye.
What it is
Canthal tilt is the angle between the inner corner of the eye and the outer corner. If the outer corner sits higher, the tilt is positive (upturned); level is neutral; lower is negative (downturned).
How it's measured
The inner and outer corner of each eye are landmarks. The angle of each eye's corner-to-corner line against the horizontal is taken in a levelled frame and the two are averaged.
How it's read
A mild positive tilt reads as alert and youthful, and women are generally scored toward slightly more tilt than men. A neutral tilt is common and fine. A clearly negative tilt can read as tired, though many striking faces have it.
What affects it
Head roll is the biggest distortion, which is why the measurement levels the eye line first. Eyelid shape, brow position and under-eye puffiness change how the tilt looks without changing the corners themselves.
For more detail, see the full guide: Canthal tilt.
Related measurements
In the same group: One Eye Apart Test, Eye Aspect Ratio and Eye Separation Ratio. The full list is on the Harmony overview.
See it on a full report
Open the sample report to see every measurement, score and highlight on a real example.