# Eye Separation Ratio

Harmony · Front view · Eyes · https://www.faceiqlabs.com/support/harmony/eye-separation-ratio

Distance between the pupil centers as a percentage of cheekbone width.

## What is measured

Calculation: Interpupillary distance ÷ cheekbone width × 100

## Why it matters

Eye spacing is perceived within the surrounding face. Identical pupil spacing occupies a larger share of a narrow face than a wide face, so the denominator changes the visual relationship.

- Lower: pupils occupy a smaller share of face width.
- Higher: pupils occupy a larger share of face width.

## Where the idea comes from

Evidence: Classical proportion. Eye spacing has a long history in proportion analysis. Pallett and colleagues tested interocular spacing relative to face width in controlled images; that study is relevant context, with limits from its stimuli and participants.

## A worked example

64 units between pupils in a face 140 units wide gives 45.7%. The same spacing in a 150-unit-wide face gives 42.7%.

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

## How to read your result

Look straight at the camera. This is pupil spacing, not the gap between the inner eye corners.

## 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/eye-separation-ratio · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt