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Living with Congenital achiasma

A rare genetic eye and nerve condition from birth in which the optic nerves do not cross, affecting vision and eye movement.

Understanding Congenital achiasma

Congenital achiasma is a rare genetic condition in which the optic chiasm, where the optic nerves normally cross, is missing from birth.

The optic nerve fibers do not cross to the opposite side of the brain. This leads to decreased vision, eyes that do not line up (strabismus) and shaky eye movements (nystagmus) in infancy. It occurs on its own rather than as part of a syndrome.

Signs & symptoms

Symptoms vary from person to person. GARD's summary lists:

  • Decreased vision
  • Eyes that do not line up (strabismus)
  • Shaky eye movements (congenital nystagmus)

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
How much vision is expected, and could it change?
What support can help with nystagmus and strabismus?
Is genetic testing available for our family?

Quick facts

Symptoms usually startNewborn and as an Infant

GARD says changes in genes cause this condition, but doesn't list a specific gene or inheritance pattern.

GeneticNeurological

Also known as: congenital absence of optic chiasma

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Congenital achiasmaGARD ID 21438 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Congenital achiasma.

Explore the Congenital achiasma blog

Explore research for Congenital achiasma

Explore actively recruiting Congenital achiasma studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Congenital achiasma with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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