Canthal Tilt
Canthal tilt is the angle between the inner and outer corners of the eye, measured against a horizontal baseline.
Definition
Canthal tilt describes the orientation of the palpebral fissure — the slit-shaped opening between the eyelids. Anatomically, it is the angle formed by a line drawn from the medial canthus (inner eye corner) to the lateral canthus (outer eye corner), measured relative to the true horizontal of the face. A positive tilt means the lateral canthus sits higher than the medial canthus. A negative tilt means it sits lower. A neutral tilt means both corners are level. Canthal tilt is one of the most reliably measurable facial metrics and is consistently studied in attractiveness research, plastic surgery, and cephalometric analysis. Most adults have a canthal tilt between -2° and +8°, with population averages clustering near +4°.
Why it matters
Canthal tilt is a primary driver of perceived eye shape and is one of the strongest single predictors of perceived attractiveness in eye-region research. A positive tilt of roughly +3° to +8° creates the almond-shaped eye widely associated with model and celebrity faces. A negative tilt is associated with a tired, sad, or downturned expression. Because the lateral canthus is anchored to the lateral orbital rim, canthal tilt also signals underlying skeletal architecture — strong infraorbital and lateral orbital bone tend to support a positive tilt.
How AI measures it
AI tools detect 68+ facial landmarks, then locate the medial and lateral canthus on each eye. The system computes the angle between the line connecting these two points and the interpupillary horizontal (or chin-to-forehead vertical, depending on calibration). The result is reported in degrees, signed positive if the lateral corner is higher. Photo head-tilt is corrected automatically by aligning to the eye axis or facial midline before measuring.
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Frequently asked questions
What is a normal canthal tilt?
Most adults have a canthal tilt between 0° and +6°. Population averages cluster around +4°. Anything more negative than -2° is uncommon and reads as a noticeably downturned eye.
Can you change your canthal tilt?
Soft tissue position can shift mildly with body fat, sleep, and lid puffiness, but the underlying angle is set by bone (lateral orbital rim) and ligament (lateral canthal tendon). Surgical canthopexy or canthoplasty are the only ways to permanently change the angle.
Is positive canthal tilt always better?
Beyond about +10°, the eye begins to read as artificially upturned or "fox-like," which can look unnatural. The most consistently attractive range in research is +3° to +8°.