# Eye Aspect Ratio

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

The width of the visible eye opening divided by its height, averaged across both eyes.

## What is measured

Calculation: Average of each eye’s corner-to-corner width ÷ upper-to-lower eyelid height

## Why it matters

It separates a relatively elongated eye opening from a rounder one. The ratio concerns the opening between the eyelids, so it can change with expression even when the eye corners stay fixed.

- Lower: relatively rounder or more open eyes.
- Higher: relatively narrower vertical openings for their width.

## Where the idea comes from

Evidence: FaceIQ adaptation. This is a FaceIQ landmark-based description of facial shape. The linked research provides background on facial measurement or perception; it has not directly validated this exact formula or its score.

## A worked example

An opening 30 units wide and 10 high has a ratio of 3.0. At a height of 12 with the same width, it becomes 2.5.

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

## How to read your result

Squinting, looking up or widening the eyes changes the height. Use a relaxed gaze and assess both sides.

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