What canthal tilt is, how it is measured from a photo, why there is no validated "ideal", why we show it but never score it, and what does and doesn’t change it.
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Short answer
Canthal tilt is the angle of the line from the inner corner of the eye to the outer corner, against horizontal: positive when the outer corner sits higher. It varies widely between people and with age, and no study has validated an "ideal". The app shows it beside a typical range (-0.8° to 4.2° on the masculine reference set, our own estimate) and never scores it.
What it is
Draw a line from the inner corner of the eye (the medial canthus) to the outer corner (the lateral canthus). Canthal tilt is that line’s angle against the horizontal. Above zero, the outer corner is higher ("positive tilt"); below zero, it is lower ("negative tilt").
Forums treat positive tilt as a must-have. The honest picture is plainer: tilt differs a lot between families and backgrounds, changes with age as the lower lid relaxes, and is only one of many things that make eyes read as alert or tired.
How a photo measures it, and what throws it off
Head roll: tilt your head a few degrees and both eyes tilt with it. Any measurement has to level the face first (the app corrects for roll on the mesh).
Head pitch: looking up or down changes the apparent angle. Keep your chin level.
Expression: smiling lifts the lower lid and the outer corner. Use a relaxed face.
Glasses: lenses can shift where the corners appear.
Is there an ideal canthal tilt?
Not a validated one. We couldn’t trace the commonly quoted targets (a few degrees positive, higher for women) to a primary study, so we don’t use them. What studies do show is that eye area judgements are shaped by many cues at once: brow position, lid fullness, under-eye shadows, and how rested someone looks.
What changes how your eyes read (and what doesn’t)
Measured on the 478-point mesh, averaged across both eyes, and shown for interest only. Its typical range is our own estimate (-0.8° to 4.2° masculine, 0.2° to 5.2° feminine), not a published norm, because the commonly quoted figures have no traceable source. It never moves your Eyes score or your overall.
Questions people ask
What is a good canthal tilt?+
There isn’t a validated "good" number. Tilt varies widely between people and with age; the app shows yours beside a typical range for interest and never scores it.
Can I change my canthal tilt?+
Not with exercises, mewing or taping. Only surgery changes the corner position, and that is a medical decision with risks, not a style choice.
Is negative canthal tilt bad?+
No. It is common, and on its own it says little about how a face reads. Sleep, brows and expression change how the eye area looks far more visibly.