Canthal Tilt Test: Positive, Neutral or Negative?

What is canthal tilt?

The corners of the eye are called the canthi: the medial canthus on the nose side and the lateral canthus on the outer side. Canthal tilt is the angle of the line between them, compared with a level line across the face. Doctors also call it the inclination of the palpebral fissure, the opening between the eyelids.

Eyelid surgery references commonly describe the outer corner sitting about 2 mm above the inner one. On an eye about 30 mm wide, that is a mildly positive tilt of roughly 4 degrees. It is a common description, not a target, and plenty of faces sit either side of it.

How this test measures it

The scan places 478 landmarks on your face, including the inner and outer corner of each eye. It then rotates the face so the line through your two outer corners is level, which removes any sideways tilt of your head. On that level face it measures the angle from each inner corner to its outer corner. Positive means the outer corner is higher.

You get one number for each eye and their average. The lines on your photo show what was measured: one line through each eye's corners, run on past them so the angle is easy to see, and the level line through the two outer corners it is measured against.

Because the level line runs through both outer corners, a difference in height between your two eyes reads as head tilt and is removed. The per-eye numbers still show whether one eye tilts more than the other.

Positive, neutral and negative canthal tilt

There is no agreed clinical cut-off between the three, so this test uses its own band and says so: within 2 degrees either side of level reads as neutral.

Positive (above +2°)

The outer corners sit higher than the inner corners. This is the most common reading, and the upward slant often called an upturned or cat-eye look.

Neutral (−2° to +2°)

The corners sit close to level. The eye reads as straight across.

Negative (below −2°)

The outer corners sit lower than the inner corners, which gives a softer, downturned look. Some people have it from youth; for others it develops with age.

What is a normal canthal tilt, and is positive better?

Most adult eyes measure a few degrees positive, but the range is wide. The average tilt differs between people, between the sexes and between populations, and the two eyes of one person rarely match exactly. A difference of a degree or two between your eyes is ordinary.

Online, a positive tilt is often called the attractive one. Aesthetic writing does tend to describe a mildly positive tilt as youthful and alert, but research on tilt alone is limited, and the overall balance of a face, along with skin, brows, expression and how the eye area is framed, matters far more than a few degrees at the corners. Many faces people find striking have a neutral or negative tilt.

With age the outer corner and lower lid tend to loosen and descend, so the tilt usually flattens over the decades. A tilt that has changed noticeably and recently, or on one side only, is worth showing to a doctor.

Why your canthal tilt changes from photo to photo

The angle is only a few degrees, so small things in the photo move it. Head roll is removed, but other head movements are not.

The outer corners sit further back in the head than the inner corners. Tipping your chin down therefore lifts the outer corners in the picture and makes the tilt read more positive; tipping it up does the opposite. This is why the same face can look upturned in one selfie and level in another.

Chin level, camera at eye level

Hold the phone straight out in front of your eyes, not below your chin or above your head.

Neutral face, eyes relaxed

Smiling pushes the lower lids up and squinting narrows the eye, and both move the corners.

Face the camera

A turned head shortens one eye and changes both angles. Look straight into the lens.

Step back

Hold the camera at arm's length or further. Close wide-angle shots distort the middle of the face.

Readings within a degree or two of each other are within the measurement's noise. Take two photos the same way and compare them before you trust a small difference.

Can you change your canthal tilt?

The bony position of the corners does not change with exercises, and no face exercise has been shown to lift them. What changes how the tilt reads is everything around it: brow shape and position, eyeliner or lash placement that extends the outer corner upward, sleep and puffiness, and the angle of your photos.

Surgery that repositions the outer corner (canthoplasty) exists, mainly for eyelid problems and age-related laxity. It carries real risks and is a decision for a qualified oculoplastic surgeon, not for a score.

The Full Report reads your eye area alongside every other measurement of your face, and ranks the changes in grooming, brows, hair and photo technique that will make the most visible difference for you.