Pseudostrabismus: Understanding False Misalignment of the Eyes

Pseudostrabismus is the false appearance of crossed eyes (strabismus). The eyes are actually properly aligned, but facial anatomy creates an optical illusion of misalignment. It is extremely common in infants and young children.

Common Causes

• Wide Nasal Bridge: Common in infants; reduces visible sclera nasally, making eyes appear crossed.
• Epicanthal Folds: Skin folds covering the inner eye corners (common in East Asian descent, also in Down syndrome).
• Asymmetric Facial Features: Uneven eyelid shape, position, or facial asymmetry.
• High Hyperopia: Can cause true accommodative esotropia, but pseudostrabismus is purely structural.

Key Features

• Eyes appear crossed, especially in side gaze or photos.
• Corneal light reflex test (Hirschberg) shows centered reflections in both eyes (proving normal alignment).
• No double vision, eye strain, or vision loss.
• Often improves with facial growth (nasal bridge develops, epicanthal folds diminish).

Diagnosis

An eye doctor performs:

• Corneal light reflex (Hirschberg) test.
• Cover-uncover test and alternate cover test.
• Visual acuity and cycloplegic refraction.
• Ocular motility assessment.

These confirm true alignment and rule out true strabismus.

Management

• Reassurance: No treatment needed; condition is cosmetic only.
• Monitoring: Periodic checks to ensure true strabismus doesn't develop (especially if risk factors like hyperopia or family history exist).
• Parental Education: Explain it's a normal variant, not a vision problem.

When to Seek Evaluation

See an eye doctor if:

• Appearance worsens or doesn't improve with age.
• Child turns/tilts head consistently.
• One eye appears to drift intermittently (true intermittent strabismus).
• Family history of strabismus or amblyopia.

Pseudostrabismus is common in infants and usually resolves with growth. Professional evaluation provides peace of mind and ensures early detection of any true alignment issues.