Front view - Nose
Deviation of IAA and JFA
The difference between the ipsilateral alar angle and the jaw frontal angle. Small deviations mean the midface and the jaw taper along similar lines, a conventional marker of a harmonious face; large deviations mean they diverge.
What counts as ideal
The ideal band differs by sex for this measurement: 0.0 deg to 2.5 deg for men and 0.1 deg to 1.7 deg for women. A reading anywhere inside the band scores a full 10.
Male ideal
0.0 deg to 2.5 deg
Female ideal
0.1 deg to 1.7 deg
How it is scored
Everything inside the band scores 10, and the penalty accelerates the further a reading falls outside it rather than dropping off a cliff at the edge. For the male band, the falloff is measured against bounds of -7.5 deg and 14.2 deg: a reading out at either of those has spent its full allowance and scores about 3. The curve keeps going past them, so an extreme reading still separates from a merely poor one.
Deviation of IAA and JFA is one of 67 measurements in the harmony pillar. No single measurement decides a face: each one contributes its own shortfall to a weighted mean, and one hopeless measurement costs a full measurement's worth and never more.
How 84 celebrities measure
Every profile in the library, measured from hand-placed landmarks and scored against the band for that person's sex and ancestry. Readings run from 0.3 deg to 30.7 deg, with a median of 7.1 deg. 13 of 84 land inside the ideal band.
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Upload a front and side photo, place the pins, and every profile in the library is ranked by the measurements you share with it.