Canthal Tilt Explained

What canthal tilt is

Each eye has two corners, called canthi. The inner corner (medial canthus) is the one closest to your nose, and the outer corner (lateral canthus) is the one nearest your temple. Canthal tilt is the angle you get by drawing a line through those two points and comparing it with a horizontal line.

• Positive tilt: the outer corner sits higher than the inner corner. This is often called an upturned or lifted eye shape.
• Neutral tilt: both corners sit at roughly the same height.
• Negative tilt: the outer corner sits lower than the inner corner, which some describe as downturned.

It is a descriptive measurement of eye shape, much like face shape is of the outline of the face. It is not a diagnosis, and it does not make a face better or worse.

How it is measured

Measurement needs a picture taken straight on, with the head level and the camera at eye height. In a face-analysis tool, landmark points are placed on the inner and outer corners of each eye. The angle between each corner-to-corner line and horizontal is then calculated.

Why the head must be level

Tilt your head by a few degrees and both eyes appear rotated by the same few degrees. Because canthal tilt itself is small, a small head roll can swing the result from positive to neutral. LookFlex corrects for head roll using the line between the eyes, but the correction is only as accurate as the landmarks.

Why one picture is not enough

• Smiling raises the cheeks and narrows the eye opening, which changes how the outer corner sits.
• Camera height changes the apparent angle, so keep the lens at eye level.
• Tired or puffy eyes alter the lower lid and the visible corner. After a night of lost sleep, observers rated faces as having droopier eyelids and more swollen eyes (Sundelin et al., 2013).
• Makeup, eyeliner and wing shapes can change the perceived corner without changing the real one.

What is typical

Eye shape varies naturally between individuals. The research is thin: one small photo-editing study found female faces with an exaggerated eye-corner tilt were usually preferred (Bashour & Geist, 2007), and a study of 42 celebrities found the women's eyes tilted more upward than the men's (Liu et al., 2023). Both are small, and neither establishes an ideal angle for anyone. Treat any quoted range, including LookFlex's own, as a loose reference rather than a target.

How an eye reads is subjective and depends on the whole face: brow position, lid fold, lashes, eye spacing and expression. A face with a negative tilt can look warm and engaging, and a positive tilt on a face with low-set brows can still look tired.

Why the internet is obsessed, and why you should relax

Canthal tilt has become a headline metric in some online communities, usually framed as a pass or fail. The research does not support that framing: the few studies are small (Bashour & Geist, 2007; Liu et al., 2023). Perception of faces draws on many cues at once. Sleep alone changes how healthy and attractive a face is rated (Axelsson et al., 2010), and even-toned skin does the same (Fink et al., 2006).

Tilt is also only one part of the eye area. Brows matter a great deal: removing the brows from photos of famous people made them harder to recognise than removing the eyes (Sadr et al., 2003).

What you can influence

The bone and tissue that set your tilt are not something to change at home. What you can influence is how the eye area looks day to day.

• Brow shape: a clean brow with a slight lift at the tail opens the eye. See grooming brows and beard for safe shaping.
• Sleep and puffiness: swollen lids and dark under-eyes can make eyes look heavier. Read sleep and your face.
• Dark circles: colour under the eye adds visual weight. See dark circles: causes and what helps.
• Lashes and liner: curled lashes and liner extended slightly outward change the visual line of the eye. This is a styling choice, not a measured effect.
• Glasses: frames with an upswept outer edge add a lifted line, while heavy lower rims can drag it down. Again, this is styling advice.

Things to avoid

Because canthal tilt is so discussed, it attracts risky advice. Skip these:

• Taping, gluing or stringing the corners of the eyes. The skin there is delicate and easy to injure.
• Eye exercises or massage tools that promise to rotate the eye shape. We found no credible evidence that they work.
• Unlicensed injections or threads. Complications near the eye can be serious, so only a qualified surgeon should be involved.
• Cropping or angling photos to fake a lifted eye and then judging yourself against it.

How LookFlex reports it

LookFlex measures canthal tilt from face landmarks on your device and reports it with a plain-language reading, the typical range and a margin for how far a retake could move it. It checks head roll and tells you if the photo is too tilted to trust. The result is one of sixteen measurements and it informs how the app words its suggestions, but it never drives a pass or fail. You can see how this works on the canthal tilt measurement page, or run a free scan on your iPhone and look at your own number with the caveats above in mind.

1. Hold the phone at eye level and look straight into the lens.
2. Keep a neutral expression and your head level.
3. Scan twice on different days and compare the direction, not the exact degrees.