What canthal tilt actually tells you about your eyes

Canthal tilt is the parameter that broke containment. It used to live inside aesthetic plastic surgery papers. Now it has its own corner of TikTok, an active subreddit thread every week, and a thousand people in the comments insisting their negative tilt is the reason they are single.

Most of that content is wrong, or at least overstated. Here is what the parameter actually measures and what it can and cannot tell you.

Definition

Canthal tilt is the angle, in degrees, between two points on one eye: the medial canthus (inner corner) and the lateral canthus (outer corner), measured against a horizontal reference line.

• Positive tilt: lateral canthus sits higher than the medial canthus. The eye reads as "upturned."
• Neutral tilt: the two canthi are level.
• Negative tilt: lateral canthus sits lower than the medial canthus. The eye reads as "downturned."

Most adults have a small positive tilt. Gender-typical ranges differ slightly: roughly 2 to 6 degrees for males and 4 to 8 degrees for females, with significant ethnicity variance.

Why aesthetic medicine cares

Canthal tilt drops with age. The lateral canthus descends due to soft-tissue laxity and orbital changes, typically 1 to 3 degrees over decades. That descent is part of what makes an older face read as tired even before wrinkles are visible. Procedures like canthopexy and lateral retinacular suspension exist specifically to restore the angle. A clinician evaluating a patient for these procedures will reference canthal tilt as a baseline.

What canthal tilt does not predict

It does not predict attractiveness. There is no study that has cleanly isolated canthal tilt as a primary attractiveness driver. The viral threads claiming a 6-degree positive tilt is required for romantic success are inventing the relationship.

It also does not predict matchmaking outcomes, dating-app success, or personality, none of which any morphometric parameter has been shown to predict in any well-powered study.

How Facet measures it

Facet uses the MediaPipe landmark coordinates for the medial and lateral canthus of each eye, then computes the angle against a horizontal reference defined by the inter-pupillary line. The result is reported in degrees with a sign, against ethnicity-keyed gender-typical bands from the morphometry literature.

It is one of the simpler parameters in the scoring engine. The interpretation around it is the harder part, and the part most internet discourse gets wrong.