# Midface–Jaw Angle Difference

Harmony · Front view · Nose · https://www.faceiqlabs.com/support/harmony/deviation-of-iaa-ipsilateral-alar-angle-jfa-jaw-frontal-angle

The absolute difference between the eye–nose triangle angle and the frontal jaw angle.

## What is measured

Calculation: |Ipsilateral Alar Angle − Jaw Frontal Angle|

## Why it matters

It compares the taper of the central face with the taper of the lower face. Similar numbers mean these two geometric constructions have similar angles, even though their widths and heights can differ.

- Near zero: the two reported angles are similar.
- Larger: the reported angles differ more, regardless of which is greater.

## Where the idea comes from

Evidence: FaceIQ adaptation. This is a composite FaceIQ comparison built from two existing measurements. The cited feature-arrangement study gives context, but does not test whether matching these angles improves attractiveness.

## A worked example

An alar angle of 91° and jaw frontal angle of 88° differ by 3°. Reversing those values still gives 3°.

Example values explain the calculation. They are not a target range.

## How to read your result

A small difference does not mean both individual measurements are within their reference ranges. Read them separately too.

## Research & further reading

These sources explain the history or related evidence. FaceIQ’s score weights and reference ranges are model settings; the papers do not collectively validate the scoring system.

- Pallett, Link & Lee (2010). [New “Golden” Ratios for Facial Beauty](https://pmc.ncbi.nlm.nih.gov/articles/PMC2814183/). Four experiments varied eye spacing and eye-to-mouth distance in face images. Preferences depended on feature arrangement. The tested ratios and stimuli do not validate every FaceIQ measurement or a universal ideal.

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Source: https://www.faceiqlabs.com/support/harmony/deviation-of-iaa-ipsilateral-alar-angle-jfa-jaw-frontal-angle · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt