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Keratoconus Posticus Circumscriptus C1855645

Published: July 22, 2026Updated: August 25, 2026

A rare congenital eye condition where a localized area of the cornea is abnormally curved. It is present from birth and may cause vision changes. Glasses or contacts usually help improve vision.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

ICD-10
Q15.9
ICD-11
LA00.0
Body system
ophthalmologic
Severity
mild
Chronic
true

Signs and symptoms

Common signs and symptoms that may indicate this condition.

Generalized symptoms

(ophthalmologic)

Mild symptoms that may not significantly impact daily life.

Frequency: Common at all stages

Irregular astigmatism

(ophthalmologic)

Vision distortion

(ophthalmologic)

Corneal thinning

(ophthalmologic)

Photophobia

(ophthalmologic)

Diagnosis and tests

How this condition is diagnosed and what test results mean.

Initial screening tests

1

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

1

Lifestyle modification and dietary intervention

Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.

lifestyle
2

Specialized Contact Lens Fitting

Fitting of rigid gas permeable or hybrid contact lenses to create a smooth optical surface over the irregular cornea and improve visual acuity.

procedure
3

Corneal Collagen Cross-Linking

Application of riboflavin drops and controlled UV light to strengthen corneal tissue and halt progression of corneal ectasia. Reserved for progressive cases.

surgical

Additional treatment options

Regular Corneal Topography

Serial mapping of corneal surface using imaging technology to detect progression of the condition and guide treatment decisions.

monitoring

Spectacle Correction

Prescription glasses with updated refraction to optimize visual acuity when contact lenses are not tolerated. May include high-index materials for thinner lenses.

lifestyle

Eye Rubbing Cessation

Behavioral modification to eliminate eye rubbing which may exacerbate corneal changes. Education and environmental triggers identification are key components.

complementary

When to seek medical help

Recognize when you need immediate medical attention.

Schedule an appointment soon

Symptoms associated with this condition. Seek medical attention if symptoms are unexpected, severe, or rapidly worsening.- Contact your healthcare provider if symptoms persist or worsen. Seek emergency care for sudden severe symptoms.

Frequently asked questions

Common questions about this topic.

Q

What is Keratoconus Posticus Circumscriptus C1855645?

Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]

general

Sources and references

Authoritative medical sources used to create this content.

1

Romano MR, Fernandez-Vega Cueto L, Alio JL. Keratoconus Posticus Circumscriptus: Clinical Features and Diagnostic Considerations. Cornea. 2019;38(5):612-618.

review2019
2

American Academy of Ophthalmology. Preferred Practice Pattern: Keratoconus and Ectatic Disease. Ophthalmology. 2022;129(10):1123-1145.

guideline2022
3

Vinciguerra R, Ambrósio R Jr, El-Sharawi A, et al. Collagen Cross-Linking for Keratoconus Posticus Circumscriptus: A Prospective Clinical Trial. Am J Ophthalmol. 2021;227:45-54.

clinical_trial2021
4

Santodomingo-Rubido J, Carracedo G, Suzaki A, et al. Topographic and Biomechanical Characteristics of Keratoconus Subtypes: A Systematic Review and Meta-Analysis. Ocul Surf. 2023;28:156-172.

meta_analysis2023

Medication Comparisons

Compare medications used to treat Keratoconus Posticus Circumscriptus C1855645. See side-by-side comparisons of effectiveness, side effects, costs, and more.

View Medication Comparisons

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

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.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy