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What Is Unilateral Esotropia?

Unilateral esotropia is a form of strabismus where one eye turns inward toward the nose while the other eye fixates more consistently. It can be intermittent or constant and may begin in infancy, childhood, or adulthood depending on the cause. In children, the brain may suppress the turned eye to avoid double vision, which can lead to amblyopia. In adults, sudden esotropia often causes noticeable double vision and needs prompt evaluation.

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What Is Unilateral Esotropia?

Unilateral esotropia is a form of strabismus where one eye turns inward toward the nose while the other eye fixates more consistently. It can be intermittent or constant and may begin in infancy, childhood, or adulthood depending on the cause. In children, the brain may suppress the turned eye to avoid double vision, which can lead to amblyopia. In adults, sudden esotropia often causes noticeable double vision and needs prompt evaluation.

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Types and causes

Clinicians classify esotropia by age of onset and whether it is related to focusing. Common causes and patterns include:

  • Accommodative esotropia linked to farsightedness and focusing effort
  • Infantile esotropia that starts in early infancy
  • Acquired non-accommodative esotropia
  • Sensory esotropia from reduced vision in one eye
  • Neurologic causes such as sixth cranial nerve palsy

Identifying the type helps determine the safest and most effective treatment plan.

Symptoms and effects

The most obvious sign is one eye turning inward, which may be more noticeable when tired or focusing at near. Children may close one eye, tilt the head, or have reduced depth perception. Amblyopia can develop if the brain relies on the stronger eye and ignores the deviating eye. Adults are more likely to report double vision, eye strain, or headaches.

How it is diagnosed

Diagnosis includes cover testing to measure the angle of deviation and assess how well the eyes work together. A full refraction is important because correcting farsightedness can reduce or eliminate accommodative esotropia. Clinicians also evaluate eye movements to look for nerve palsies and check for amblyopia in children. Additional testing or imaging may be recommended when onset is sudden or neurologic signs are present.

Treatment options

Treatment may include glasses to correct farsightedness, sometimes with bifocals for near control in selected cases. Amblyopia therapy, such as patching or atropine penalization, may be used to strengthen the weaker eye in children. Prisms can help reduce double vision in some patients, and strabismus surgery is considered when alignment remains poor or control is inadequate. Early treatment supports better binocular vision development and long-term comfort.

FAQs on unilateral diplopia

Can unilateral esotropia cause amblyopia?

Yes. In children, the brain may suppress input from the turning eye, which can reduce vision development and lead to amblyopia. Early detection and treatment improve the chance of good outcomes.

Can glasses fix unilateral esotropia?

They can, especially in accommodative esotropia caused by farsightedness. Correcting the prescription reduces focusing effort and can improve alignment. Some patients still need additional treatment for residual deviation.

When is surgery recommended?

Surgery is considered when the eye turn is frequent, constant, or not adequately controlled with glasses and other measures. It may also be recommended to improve binocular function and appearance. The decision depends on measurements, control, and visual development.

Why do some adults get sudden double vision?

Adults usually do not suppress double vision as easily as children. Sudden-onset esotropia can be related to decompensation of a long-standing tendency, nerve palsy, or other neurologic or orbital causes. New double vision should be evaluated promptly.

References

Esotropia. StatPearls Publishing (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK578207/. Date Accessed: February 19, 2026.

Strabismus. StatPearls Publishing (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK560782/. Date Accessed: February 19, 2026.

Infantile Esotropia. American Association for Pediatric Ophthalmology and Strabismus. https://aapos.org/glossary/infantile-esotropia. Date Accessed: February 19, 2026.

Accommodative Esotropia. American Association for Pediatric Ophthalmology and Strabismus. https://aapos.org/glossary/accommodative-esotropia. Date Accessed: February 19, 2026.

Dissociated Vertical Deviation. StatPearls Publishing (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK573061/. Date Accessed: February 19, 2026.