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Esotropia – Inward Squint: Causes & Treatment

Esotropia is a form of strabismus in which one or both eyes turn inward toward the nose. It commonly affects children and can impair depth perception.

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Things worth knowing about "Esotropia"

Esotropia is a form of strabismus in which one or both eyes turn inward toward the nose. It commonly affects children and can impair depth perception.

What is Esotropia?

Esotropia is one of the most common forms of strabismus (squint or eye misalignment). In this condition, one eye – or occasionally both eyes – deviate inward toward the nose while the other eye looks straight ahead. The misalignment may be constant or intermittent and most frequently affects infants and young children, though it can also develop in adults.

Causes

The causes of esotropia are varied and not always fully understood. Known risk factors and causes include:

Accommodative esotropia: Often triggered by uncorrected farsightedness (hyperopia). The eyes must work harder to focus, which promotes inward turning.
Infantile esotropia: Develops within the first six months of life, frequently without an identifiable cause (idiopathic).
Neurological conditions: Disorders affecting cranial nerve VI (abducens nerve) or other neurological causes can lead to esotropia.
Genetic factors: A family history of strabismus increases the risk of developing esotropia.
Secondary esotropia: Can result from significantly reduced visual acuity in one eye (e.g., due to cataract or retinal disease).

Symptoms

The typical signs of esotropia include:

Visible inward turning of one or both eyes
Double vision (in adults or older children)
Squinting or closing one eye, especially in bright light
Head tilt or abnormal head posture
Reduced depth perception (stereoscopic vision)
Development of amblyopia (lazy eye) in the deviating eye if left untreated

Diagnosis

Diagnosis is made by an ophthalmologist and may include the following assessments:

Hirschberg test: Evaluation of corneal light reflexes in both eyes
Cover test: Standard procedure to assess the angle and type of deviation
Refraction assessment: Measurement of refractive errors, especially farsightedness
Stereoacuity testing: Evaluation of depth perception
Fundus examination: To rule out organic causes such as retinal or optic nerve disorders

Treatment

Treatment of esotropia depends on the underlying cause and severity. The goals are to improve visual acuity, eliminate double vision, and achieve a cosmetically acceptable eye alignment.

Conservative Treatment

Spectacle correction: In accommodative esotropia, glasses with the appropriate hyperopic correction can fully or partially correct the inward deviation.
Occlusion therapy (patching): The dominant (healthy) eye is covered to stimulate the weaker eye and prevent the development of amblyopia.
Prism glasses: Can be used in certain types of esotropia to compensate for double vision.

Surgical Treatment

Strabismus surgery: When spectacle correction is insufficient, surgery on the extraocular muscles (e.g., recession of the medial rectus muscle) may be required to correct the eye alignment.

Additional Options

Botulinum toxin injections: In selected cases, botulinum toxin can be injected into the overactive eye muscle to temporarily or permanently reduce the deviation.

Prognosis

With early diagnosis and consistent treatment, the prognosis for esotropia is generally favorable. Timely intervention is especially important to prevent permanent amblyopia and to preserve or develop normal binocular vision. Regular ophthalmological follow-up is essential, particularly during childhood.

References

von Noorden GK, Campos EC. Binocular Vision and Ocular Motility: Theory and Management of Strabismus. 6th ed. Mosby; 2002.
American Academy of Ophthalmology (AAO). Esotropia and Exotropia – Preferred Practice Pattern. AAO; 2017. Available at: https://www.aao.org
Simonsz HJ, Kolling GH. Best age for surgery for infantile esotropia. Strabismus. 2011;19(3):109-117. doi:10.3109/09273972.2011.600370

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