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Congenital microcoria is a rare autosomal dominant ophthalmological disease caused by maldevelopment of the dilator muscle of the pupil that is characterized by small pupils (<2 mm in diameter) from birth, peripheral iris hypopigmentation and transillumination defects leading to errors of refraction (myopia, astigmatism) and sometimes juvenile open angle glaucoma.
Features include sometimes findings: Glaucoma; and rarely findings: Ocular hypertension. 6 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Eyes | 2 | Ocular hypertension, Glaucoma |
Heart and blood vessels |
Estimated prevalence: Unknown (Unknown prevalence).
1 clinical trial registered, 1 recruiting. Interventions under study include other interventions. Research is primarily sponsored by academic and government institutions.
6 publications have been identified in PubMed for congenital microcoria. Research spans Case Report / Case Series (83%) and Basic Science / Preclinical (17%).
Gao JF (2026). [PMID: 40921432](https://pubmed.ncbi.nlm.nih.gov/40921432/). *Clin Genet*. [Case Report / Case Series]
Arteaga Henríquez C (2025). [PMID: 39642989](https://pubmed.ncbi.nlm.nih.gov/39642989/). *Arch Soc Esp Oftalmol (Engl Ed)*. [Case Report / Case Series]
Merino P (2025). [PMID: 40419187](https://pubmed.ncbi.nlm.nih.gov/40419187/). *Arch Soc Esp Oftalmol (Engl Ed)*. [Case Report / Case Series]
Choudhary DS (2025). [PMID: 40858344](https://pubmed.ncbi.nlm.nih.gov/40858344/). *BMJ Case Rep*. [Case Report / Case Series]
Ma Z (2024). [PMID: 38877448](https://pubmed.ncbi.nlm.nih.gov/38877448/). *BMC Ophthalmol*. [Case Report / Case Series]
Data assembled from 6 of 12 sources · Last updated Sep 18, 2026, 2:44 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
1
Ocular hypertension |
Muscles | 1 | Hypoplasia of the iris dilator muscle |
Age of onset: at birth.
Erjavec E (2024). [PMID: 39293448](https://pubmed.ncbi.nlm.nih.gov/39293448/). *Am J Hum Genet*. [Basic Science / Preclinical]