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Related Experiment Video

Updated: Dec 30, 2025

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia

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Binasal hemianopia in two sisters.

Sam Scotcher¹, George Morphis², Peter Good³

¹West of England Eye Unit, Royal Devon and Exeter NHS Foundation Trust, Exeter, UK samscotcher@doctors.org.uk.

BMJ Case Reports

|January 24, 2020

Summary

This summary is machine-generated.

Binasal hemianopia, a rare visual defect, was observed in two sisters with no identifiable cause. This suggests a potential unknown congenital origin for this condition.

Keywords:

ophthalmology visual pathway

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Area of Science:

Ophthalmology
Neurology
Genetics

Background:

Binasal hemianopia is an uncommon visual field defect characterized by vision loss in the nasal visual field of both eyes.
The condition can be caused by various neurological or ocular pathologies, but often remains idiopathic.

Observation:

A teenage girl presented with blurred vision and headaches after a head injury.
Ocular examination revealed binasal hemianopia, but neuroimaging was normal.
Her elder sister exhibited identical visual field defects with unremarkable neuroimaging.

Findings:

This case marks the first documented instance of binasal hemianopia occurring in siblings.
The absence of neurological or ocular abnormalities in both affected sisters is a significant finding.

Implications:

The familial occurrence and lack of identifiable cause support a theory of unknown congenital etiology for binasal hemianopia.
Further research into genetic factors or previously unrecognized congenital causes is warranted.