Harmony · Front view · Eyes
One Eye Apart Test
The gap between the inner eye corners compared with the average eye-region width.
What is measured
The calculation
Inner-corner gap ÷ average inner-corner-to-outer-hood span
Front view / Measurement guide
Follow the measurement
Select a label to focus on its line. Select again to show all measurements.
Why it matters
This provides a local spacing comparison. Unlike Eye Separation Ratio, it compares the eye gap with the eyes themselves instead of the whole face width.
- Below 1: the gap is smaller than the reference eye width.
- Above 1: the gap is larger than the reference eye width.
Where the idea comes from
Classical proportion
The one-eye-width gap is a classical facial canon. FaceIQ uses the outer eyelid-hood endpoints in its denominator, which may differ from a study’s outer canthus landmarks. [1]
A worked example
A 30-unit inner-eye gap and 30-unit average eye span give 1.0. A 33-unit gap with the same span gives 1.1.
Example values explain the calculation. They are not a target range and are not measurements of the schematic above.
Research & further reading
The sources below explain the history or related evidence. FaceIQ’s score weights and reference ranges are model settings; these papers do not collectively validate the scoring system.
[1] Farkas et al. · 1985
Vertical and horizontal proportions of the face: revision of neoclassical canonsTested nine traditional proportion rules against measured faces. Useful history for facial thirds and width comparisons; classical rules are not universal targets.