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Canthal tilt: the angle that changes your whole eye area
3 min read · Updated October 4, 2026
Canthal tilt is the single eye feature people fixate on most in facial analysis — and for once, the attention is partly deserved. The eye area carries a lot of a face's impact.
What it is
Canthal tilt is the angle of the line from the inner corner of the eye (the medial canthus) to the outer corner (the lateral canthus). If the outer corner sits higher than the inner corner, the tilt is positive ('upturned'). If they're level, it's neutral. If the outer corner sits lower, it's negative ('downturned').
A mild positive tilt — a few degrees up — is usually read as alert, youthful and attractive. A negative tilt can read as tired or downcast, though plenty of striking faces have it.
How it's measured
On a level, front-on photo, the angle is taken between the inner-to-outer corner line and the horizontal. Most faces fall within a few degrees either side of neutral. Women tend to look best with a touch more positive tilt than men, which is why it's scored against sex-specific ranges.
Real tilt vs photo tilt
This is where most people get misled. Head tilt, camera height and even which eye you're measuring can swing the apparent canthal tilt by several degrees. A face that looks negative-tilted in one photo can look neutral in another taken moments later.
A good analysis corrects for head roll by levelling the eyes before measuring. Even so, if your tilt reading surprises you, retake the photo dead level and straight on before drawing conclusions.
What you can and can't change
The underlying tilt is set by your bone and soft-tissue anatomy. Appearance can be nudged by brow grooming, how you style the area, and reducing under-eye puffiness that drags the look down. Anything beyond that is a medical question for a qualified professional, and for most people it isn't worth pursuing.
Doing the math
Canthal tilt is simple trigonometry. Take the line from the inner corner of the eye to the outer corner. The tilt is the angle that line makes with the horizontal, which depends on how far the outer corner sits above or below the inner one, compared with how far apart they are sideways. For a typical eye about 30 mm wide:
| Case | Outer corner vs inner | Sideways span | Tilt |
|---|---|---|---|
| Neutral | level (0 mm) | 30 mm | 0° |
| Mild positive | 3 mm higher | 30 mm | 5.7° |
| Mild negative | 2 mm lower | 30 mm | −3.8° |
Illustrative numbers for one eye. Tilt = arctan(vertical offset ÷ horizontal span).
How much a degree really is
Over an eye 30 mm wide, one degree of tilt moves the outer corner by about half a millimetre. That is tiny, and it is within what small landmark placement differences and a slightly tilted head produce. Differences of a degree or two between two photos of the same person are normal, so don't read much into a change that small. A tilt that is consistently several degrees off across good, level photos is more meaningful.
Questions about canthal tilt
Is a negative canthal tilt bad?
No. It can read as softer or more tired, but many striking faces have it, and it is only one of dozens of measurements. The ideal ranges are set separately for men and women.
Does squinting or a smile change it?
Yes. Squinting and smiling push the lower lid up and can change where the outer corner appears. Relax your eyes, look straight at the lens and keep them fully open.
Why is my left eye different from my right?
Almost everyone has a small difference between the two sides. The app measures both and averages them, and shows any gap as part of Eye Asymmetry.
Does eye makeup affect the reading?
It can. Liner and a wing change where the visible corner of the eye appears, which can nudge where the corner is detected. For the cleanest reading, take the photo without heavy eye makeup.
See it on a full report
Open the sample report to see every measurement, score and highlight on a real example.