---
title: What causes eye turning outward (exotropia)?
description: "Exotropia is an outward turning of one or both eyes. It can be constant or appear only at times. ## Childhood and developmental causes In children, exotropia often arises from imbalance between the eye muscles or control systems. It may…"
url: "https://bluefinvision.com/knowledge-base/topics/symptoms-signs/what-causes-eye-turning-outward-exotropia/"
updated: "2025-12-31"
category: "Symptoms & Signs"
---

# What causes eye turning outward (exotropia)?

Exotropia is an outward turning of one or both eyes. It can be constant or appear only at times.

## Childhood and developmental causes

In children, exotropia often arises from imbalance between the eye muscles or control systems. It may first appear when the child is tired or daydreaming.

- Intermittent exotropia that drifts mainly when looking far away
- Congenital exotropia present from early infancy
- Family history of squint or refractive error
- Occasionally linked with neurological or developmental conditions

## Adult-onset causes

New exotropia in adults often produces double vision and needs assessment. Causes range from decompensated childhood squint to nerve or muscle problems.

- Loss of fusion control after illness, stress, or visual change
- Cranial nerve palsies affecting eye muscles
- Thyroid eye disease or trauma disrupting alignment
- Any recent-onset outward turn should be checked urgently