Landmark Geometry Guide·4 MIN READ·Ocular Axis Measurement
Canthal Tilt Guide: Positive, Neutral & Negative Eye Angles Explained
Canthal tilt measures the horizontal inclination of the palpebral fissure — the angle formed between your inner eye corner (medial canthus) and outer eye corner (lateral canthus).
How Canthal Tilt Degrees Are Classified
+2.0° TO +6.0°
Positive Tilt
The outer corner of the eye sits measurably higher than the inner corner relative to the facial midline plane.
-1.0° TO +1.9°
Neutral Tilt
The medial and lateral canthi align almost horizontally. Common across balanced, classic facial structures.
BELOW -1.0°
Negative Tilt
The lateral canthus sits lower than the medial canthus, creating a gentle downward outer slope.
3 Steps to Get an Accurate Canthal Tilt Reading
- Keep your head level: Avoid tilting your head left or right (roll) or lifting your chin (pitch), as both directly shift the 2D angle between landmarks #362 and #263.
- Step back from the camera: Hold the camera at least arm's length away at eye level to prevent wide-angle barrel distortion.
- Relax your brow and eyelids: Squinting or raising your eyebrows shifts soft tissue around the lateral canthus.
Instant Degree (°) Readout
Calculate Your Exact Canthal Tilt Angle
Upload a front-facing photo to measure your medial-to-lateral eye angle in degrees locally in your browser.