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Exotropia – Causes, Symptoms and Treatment

Exotropia is a type of strabismus where one or both eyes deviate outward. It affects children and adults and can impair binocular, three-dimensional vision.

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Things worth knowing about "Exotropia"

Exotropia is a type of strabismus where one or both eyes deviate outward. It affects children and adults and can impair binocular, three-dimensional vision.

What Is Exotropia?

Exotropia is a form of strabismus (misalignment of the eyes) in which one or both eyes turn outward, away from the nose toward the temple. Unlike esotropia, where the eye turns inward, exotropia causes the eye to drift to the side. The deviation may be constant (always present) or intermittent (occurring only at certain times).

Exotropia is one of the most common types of strabismus and can appear as early as infancy, though it also develops in adults. If left untreated, it can negatively affect visual development, particularly binocular vision – the ability of both eyes to work together to perceive depth.

Types of Exotropia

Intermittent exotropia: The most common type, in which the eye only drifts outward occasionally, such as when the person is tired, daydreaming, or in bright sunlight.
Constant exotropia: The eye is always turned outward, regardless of the viewing situation.
Sensory exotropia: Develops as a result of significantly reduced vision in one eye, which causes the brain to lose control of eye alignment.
Congenital exotropia: A rare form present from birth or appearing within the first months of life.

Causes

The exact causes of exotropia are not always fully understood. Contributing factors may include:

Muscle imbalance: Poor coordination among the external eye muscles causes the eye to drift outward.
Genetic predisposition: Strabismus tends to run in families, suggesting a hereditary component.
Neurological conditions: Damage to the nervous system or brain structures that control eye movement can lead to exotropia.
Refractive errors: Nearsightedness or farsightedness can contribute to the development of eye misalignment.
Eye injury or disease: Visual impairment caused by eye conditions or trauma can trigger sensory exotropia.

Symptoms

Symptoms of exotropia vary depending on the type and severity:

Visible outward turning of one eye, especially during fatigue or bright light
Squinting or closing one eye in bright sunlight
Double vision (diplopia), particularly in constant exotropia
Headaches or eye strain after prolonged visual activity
Difficulties with depth perception and judging distances
In children: possible development of amblyopia (lazy eye)

Diagnosis

Exotropia is diagnosed through a comprehensive eye examination, which typically includes the following steps:

Visual acuity test: Measuring the sharpness of vision in each eye.
Cover test: One eye is covered to reveal the degree of deviation in the other eye.
Ocular motility assessment: Evaluating the range and coordination of eye movements.
Refraction test: Detecting any refractive errors such as nearsightedness or farsightedness.
Binocular vision testing: Assessing whether and how well both eyes work together.

Treatment

Treatment of exotropia depends on the type, severity, and age of the patient. The primary goals are to preserve or restore binocular vision and to support normal visual development in children.

Non-surgical treatment options

Corrective glasses: Glasses can compensate for refractive errors and help reduce the angle of deviation.
Occlusion therapy (patching): Covering the stronger eye to stimulate and strengthen the weaker eye, preventing amblyopia.
Orthoptic exercises: Targeted vision training exercises to improve cooperation between both eyes.
Prism glasses: Prisms incorporated into lenses can compensate for double vision and improve eye alignment.
Botulinum toxin injection: In selected cases, an injection into the outer eye muscle can temporarily correct eye alignment.

Surgical treatment

For significant or persistent exotropia, surgery is often required. The procedure involves shortening or repositioning the external eye muscles to correct alignment. It is typically performed under general anesthesia and is a common procedure in children as well as adults. Multiple surgeries may occasionally be needed to achieve the desired result.

Prognosis

With early diagnosis and consistent treatment, the prognosis for exotropia is generally favorable. Binocular vision can often be preserved, especially in cases of intermittent exotropia. Regular follow-up examinations with an ophthalmologist are essential to monitor treatment progress and adjust therapy as needed.

References

American Academy of Ophthalmology: Preferred Practice Pattern – Esotropia and Exotropia (2012). Available at: https://www.aao.org
World Health Organization (WHO): International Classification of Diseases (ICD-11). Disorders of ocular motility. Available at: https://www.who.int
Kaufmann, H. (Ed.): Strabismus. 4th Edition. Thieme Verlag, Stuttgart 2012.

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