What the term actually describes
The midface ratio divides interpupillary distance — the space between the centers of the eyes — by the vertical distance from that same eye line down to the top of the upper lip. Online discussion of the ideal range varies (figures from roughly 0.95 up to 1.1 are all common), and a higher ratio is generally read as a more compact midface.
It's a proportion between two measurements on one face, not a comparison against an external template.
Why a single photo is the wrong tool for this specific measurement
Both distances in the ratio come from pixel positions in a 2D image, and a camera doesn't record a face at a fixed, distance-independent scale — it records a perspective projection:
- Held close — a phone's wide effective field of view compresses features nearer the lens more than features farther away, changing the eye-line-to-lip distance relative to interpupillary distance.
- Stepped back — a longer working distance measures that same face differently again.
This matters specifically for midface ratio because the ratio itself is a width-to-height comparison — interpupillary width over eye-to-lip height — and Mogalytics' own breakdown of why scores swing between scans names camera distance as the variable that changes apparent width-to-height ratios most. A single uploaded photo has no way to correct for this after the fact — there's no second frame to check it against.
What a repeatable read looks like instead
The fix isn't a better single photo, it's holding distance constant and taking more than one reading before trusting the number:
- Pick a working distance you can reproduce.
- Keep the camera at that distance across attempts.
- Check whether the ratio holds — the practice guide covers framing and distance in more detail.
If your midface reading still moves once distance is controlled for, that's a more meaningful signal than any single photo can give you.
Where this fits in Mogalytics' composite
Mogalytics tracks midface as one of six weighted geometry ratios, settled over a 30-frame trimmed-mean window so a single unstable frame doesn't define the result, alongside:
- Eye line
- Jaw ratio
- Frame symmetry
- Cheek ratio
- Bridge
It's read live from your own camera on-device, not from one uploaded photo, so you can hold a distance, check the reading, and confirm it repeats in the same session instead of guessing from a single shot. See what the full composite tier actually means once you have a stable reading, and how to track it across sessions rather than trusting any one scan.
Related reads
Midface is one piece of a six-measurement composite. If you're auditing the rest:
- Canthal tilt and the facial symmetry test — both thrown off by head angle rather than distance.
- The nose bridge ratio — has its own angle-sensitivity problem tied to the bridge's raised shape.
- Jaw ratio and cheekbone ratio — pitch- and turn-sensitive rather than distance-sensitive.
- Orbital vector — the other measurement anchored to the eye line, a side-profile depth read rather than a distance ratio.
- Golden ratio face — the other whole-face proportion claim, and why the critique literature says it doesn't generalize across populations.
- Lip ratio — shares the upper-lip landmark this ratio anchors to, but expression, not distance, is its dominant confound.
- Forehead height ratio — another cited proportion, undermined by an unstable hairline landmark rather than camera distance.