# Interior Midface Projection Angle

Harmony · Side view · Facial Profile · https://www.faceiqlabs.com/support/harmony/interior-midface-projection-angle

The direction from the nasal-wing base to the lateral eyelid endpoint, measured against horizontal.

## What is measured

Calculation: arctan(vertical eyelid-to-subalare separation ÷ absolute horizontal separation)

Nasion means the nasal root, subnasale the nose base, and pogonion the most forward chin point. Frankfort refers to the direction from the ear-opening landmark to the lower orbital landmark.

## Why it matters

This compares the height and horizontal separation of two midface landmarks. It describes their relative geometry rather than the projection of a single bone.

- Lower: the connecting direction is more horizontal.
- Higher: it is more vertical, for the same image orientation.

## Where the idea comes from

Evidence: FaceIQ adaptation. This is a FaceIQ photographic construction. Clinical profile analysis provides context, but the cited work does not validate this exact landmark formula or its scoring range.

## A worked example

A 30-unit vertical separation and 40-unit horizontal separation give arctan(30 ÷ 40) ≈ 36.9°.

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

## How to read your result

The app uses the lateral eyelid endpoint and subalare, not the ear. It cannot diagnose midface skeletal position.

## 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.

- Farkas et al. (2005). [International anthropometric study of facial morphology in various ethnic groups/races](https://pubmed.ncbi.nlm.nih.gov/16077306/). Documents variation in facial dimensions across sampled populations. Descriptive measurements explain variation; they do not establish an attractiveness score.

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Source: https://www.faceiqlabs.com/support/harmony/interior-midface-projection-angle · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt