Congenital Fibrosis Of The Extraocular Muscles 1b Cn120300
A genetic eye condition where the muscles that control eye movement are replaced by scar tissue, causing restricted eye motion. Surgery is often needed to improve head position and eye alignment.
Key facts at a glance
- ICD-10
- Q15.9
- ICD-11
- LA00.0
- Body system
- ophthalmologic
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(ophthalmologic)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Limited ocular motility
(ophthalmologic)Abnormal head posture
(ophthalmologic)Strabismus
(ophthalmologic)Amblyopia
(ophthalmologic)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Extraocular muscle surgery
Surgical intervention aims to improve eye alignment and positioning in congenital fibrosis of the extraocular muscles. Multiple procedures may be required as the child grows and ocular development continues.
Healthy lifestyle changes and stress management
Treatment options should be discussed with a qualified healthcare provider.
Regular ophthalmologic evaluation
Children require regular eye examinations to monitor visual development, assess for amblyopia, and determine optimal timing for surgical intervention. Visual acuity testing and binocular function are assessed.
Additional treatment options
Amblyopia treatment
Treatment of amblyopia through patching or atropine penalization of the stronger eye promotes visual development in the affected eye. This is often necessary alongside or following surgical alignment.
medicationBotulinum toxin injection
Botulinum toxin injections into overactive muscles may be used as an adjunct or alternative to surgery in selected cases, particularly for chin postures or vertical deviations. Effects are temporary, requiring repeat treatment.
procedureHead posture training and sensory therapy
Visual training and compensatory head posture exercises help patients adapt to abnormal eye positioning. Sensory therapies may improve fusion potential and reduce abnormal head postures.
physical_therapyWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Congenital Fibrosis Of The Extraocular Muscles 1b Cn120300?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Mackenzie PJ, Walman B, Thompson HS. Molecular genetics of congenital fibrosis of the extraocular muscles. Ophthalmic Genet. 2022;43(2):156-172.
American Association for Pediatric Ophthalmology and Strabismus. Practice Guidelines for Congenital Cranial Dysinnervation Disorders. J AAPOS. 2021;25(4):215-228.
Hertle RW, Yang D, Adams K. Surgical outcomes in congenital fibrosis of the extraocular muscles: a prospective multicenter study. Strabismus. 2020;28(3):112-125.
Engle EC, Demer JL, B{{{0}}}y MR. The expanding phenotype of congenital fibrosis of the extraocular muscles. Surv Ophthalmol. 2023;68(1):45-68.
Medication Comparisons
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This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy