Overview

What Is Exotropia?

Exotropia is a type of strabismus in which one or both eyes turn outward instead of pointing in the same direction. This outward eye deviation may be constant or intermittent, meaning it comes and goes. The exotropia definition includes eye misalignment that can affect children and adults, although it is often first noticed during childhood. Some people have an outward drift mainly when they are tired, distracted, or looking at something far away.

Symptoms

Exotropia Symptoms

  • One eye turning outward
  • Intermittent loss of eye alignment
  • Closing one eye in bright light
  • Eyestrain
  • Blurred or double vision
  • Reduced depth perception

Intermittent exotropia may be easier to notice when someone is tired, ill, daydreaming, or looking into bright light. Symptoms can vary between children and adults, and some people may not notice a problem because the eyes realign on their own. In alternating exotropia, either eye may drift outward at different times.

Causes

What Causes Exotropia?

Exotropia develops when the eyes do not maintain coordinated alignment. The exact cause may involve how the eye muscles and brain control eye position, differences in visual development, inherited tendencies, or an underlying eye or neurologic condition. In some cases, reduced vision in one eye makes it harder for the eyes to work together. A specific cause is not always found.

  • Childhood intermittent exotropia may appear when eye alignment becomes difficult to control at times.
  • Congenital or early-onset exotropia begins during infancy or early childhood.
  • A family history of strabismus or other eye alignment problems may contribute.
  • Reduced vision in one eye can interfere with coordinated binocular vision.
  • Conditions affecting eye movement, vision, or the nervous system may sometimes cause exotropia.

Risk Factors

Exotropia Risk Factors

  • Family history of exotropia or another form of strabismus
  • Childhood age and the ongoing development of coordinated vision
  • Early visual problems or reduced vision in one eye
  • A history of intermittent exotropia or poor control of eye alignment
  • Eye conditions that affect movement, focusing, or vision
  • Neurologic or other medical conditions that affect eye movement

Having a risk factor does not mean that exotropia will develop. Many people with intermittent exotropia or alternating exotropia have no single identifiable cause. Family history and early visual development cannot be changed, while treating an underlying vision problem may help support better eye coordination.

Complications

Exotropia Complications

  • Reduced binocular vision, or less ability to use both eyes together
  • Impaired depth perception
  • Amblyopia, sometimes called lazy eye, in some children
  • Eyestrain or double vision
  • Worsening control of intermittent exotropia
  • Social or emotional effects related to a noticeable eye turn

The risk and severity of complications depend on a person’s age, visual development, type of exotropia, and how consistently the eyes are misaligned. Some people retain good binocular vision despite an outward drift, while others develop difficulties with depth perception or visual comfort. Regular assessment can help identify changes early.

Diagnosis

How Is Exotropia Diagnosed?

An ophthalmologist or optometrist asks when the eye drifts, whether the problem is constant or intermittent, and whether symptoms occur during tiredness, illness, or bright light. The clinician checks visual acuity in each eye, observes eye movements and alignment, and measures the deviation at different distances and in different viewing conditions. These measurements help distinguish exotropia from exophoria, a tendency for the eyes to drift outward that is usually controlled when both eyes are open.

The examination may also assess focusing, binocular vision, depth perception, and overall eye health. A dilated eye examination or other testing may be recommended when reduced vision, an eye disease, or another medical cause is suspected. The evaluation can also show whether the pattern is alternating exotropia or whether one eye is more commonly affected.

Treatment Options

Exotropia Treatment Options

Treatment for exotropia depends on the patient’s age, the frequency and severity of eye deviation, visual function, and the underlying cause. The main goals are to improve eye alignment, maintain binocular vision, and prevent or manage amblyopia.

Observation

In some patients, especially those with intermittent exotropia and good control, regular observation may be appropriate. Eye alignment and visual function are monitored over time.

Corrective Glasses

Glasses may be prescribed to correct refractive errors such as myopia or astigmatism. Proper vision correction can help improve visual function and, in some cases, eye alignment.

Patching

Eye patching may be recommended when amblyopia is present, particularly in children. It involves covering the stronger eye for a specific period to encourage the weaker eye to develop better vision.

Vision Therapy

Orthoptic or vision exercises may be used in selected patients to improve eye coordination and control of the deviation. Their usefulness depends on the type and characteristics of exotropia.

Surgery

Strabismus surgery may be considered when the eye deviation is frequent, poorly controlled, or causes significant symptoms or cosmetic concerns. The procedure usually involves adjusting the eye muscles to improve alignment.

Treatment is individualized according to the patient’s age, symptoms, visual acuity, and degree of eye misalignment. Regular follow-up with an ophthalmologist is important to monitor changes over time.

Outlook and Prognosis

Exotropia Outlook and Prognosis

The prognosis for exotropia varies. Some people maintain good control and have an outward drift only occasionally, while others develop more frequent or constant misalignment, visual symptoms, or reduced binocular function. Intermittent exotropia can remain stable, improve in control, or become more noticeable over time.

Regular eye examinations help track alignment, vision, depth perception, and control. Treatment can improve alignment and visual comfort, but some people need reassessment or more than one intervention as their eyes and visual system change. Ongoing follow-up is especially important for children because vision is still developing.

When Should You See a Doctor

When Should You See a Doctor for Exotropia?

A new or recurring outward eye turn should be evaluated by an ophthalmologist or optometrist, especially in a child. Arrange an eye examination even when the eye sometimes appears aligned, because intermittent exotropia can still affect visual development or become harder to control. An evaluation is also appropriate when the outward turn is becoming more frequent or is accompanied by eyestrain, blurred vision, or double vision.

Seek prompt care

Sudden eye changes need urgent assessment

Arrange prompt medical evaluation for sudden eye misalignment or new vision or neurologic symptoms.

  • Sudden or rapidly worsening outward eye turn
  • New persistent double vision or vision loss
  • Severe eye pain, drooping eyelid, unequal pupils, weakness, or trouble speaking