Harmony · Front view · Eyes
Lateral Canthal Tilt
The upward or downward slope from the inner eye corner to the outer eye corner.
What is measured
The calculation
Mean signed angle of the inner-to-outer canthus line against horizontal
Front view / Measurement guide
Follow the measurement
Dots mark the landmarks. Lines show how the measurement is taken.
Why it matters
The line connecting the eye corners contributes to the eye area’s orientation. It is independent of how much upper lid is visible and should be read alongside eye shape rather than alone.
- Negative: the outer corner is lower than the inner corner.
- Positive: the outer corner is higher; zero is level.
Where the idea comes from
FaceIQ adaptation
Canthal orientation is an anatomical description of the eyelid opening. FaceIQ turns a photographic angle into a score; the population reference is background, not validation of a specific tilt target. [1]
A worked example
An outer corner 3 units higher over a 30-unit horizontal run gives arctan(3 ÷ 30), approximately 5.7°.
Example values explain the calculation. They are not a target range and are not measurements of the schematic above.
Research & further reading
The sources below explain the history or related evidence. FaceIQ’s score weights and reference ranges are model settings; these papers do not collectively validate the scoring system.
[1] Farkas et al. · 2005
International anthropometric study of facial morphology in various ethnic groups/racesDocuments variation in facial dimensions across sampled populations. Descriptive measurements explain variation; they do not establish an attractiveness score.