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Related Experiment Video

Updated: May 16, 2026

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment

Published on: March 24, 2020

Abnormal vertical angle kappa caused by ectopic fovea.

Ido D Fabian¹, Abraham Spierer, Yoav Berger

¹The Goldschleger Eye Institute, Sheba Medical Center and The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel. idofabia@post.tau.ac.il

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus

|December 15, 2012

Summary

This summary is machine-generated.

Abnormal angle kappa, a condition mimicking strabismus, can stem from retinal issues. This study identifies ectopic fovea as a novel cause of abnormal vertical angle kappa in an otherwise healthy eye.

Related Experiment Videos

Last Updated: May 16, 2026

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment

Published on: March 24, 2020

Area of Science:

Ophthalmology
Retinal Imaging
Pediatric Ophthalmology

Background:

Abnormal angle kappa is a clinical sign that can mimic strabismus.
Previous reports have linked abnormal angle kappa to structural retinal disorders like retinopathy of prematurity and familial exudative vitroretinopathy.
These conditions often involve significant retinal pathology.

Observation:

A patient presented with an abnormal vertical angle kappa.
The patient had no identifiable structural retinal disorder or other ocular abnormalities.
Detailed examination revealed an ectopic fovea as the cause.

Findings:

Ectopic fovea, a displacement of the foveal pit, can cause abnormal angle kappa.
This finding suggests that foveal position, not just retinal structure, is critical.
Abnormal angle kappa can occur in the absence of typical retinal pathologies.

Implications:

This case expands the differential diagnosis for abnormal angle kappa.
It highlights the importance of considering foveal ectopia in strabismus evaluations.
Understanding the causes of abnormal angle kappa aids in accurate diagnosis and management of pediatric eye conditions.