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Related Experiment Video

Updated: Jun 23, 2026

The Rodent Model of Nonarteritic Anterior Ischemic Optic Neuropathy (rNAION)

The Rodent Model of Nonarteritic Anterior Ischemic Optic Neuropathy (rNAION)

Published on: November 20, 2016

Optic nerve head drusen simulating a bitemporal hemianopia.

Joseph G Chacko¹, Paul H Phillips

¹Jones Eye Institute, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA. jchacko@uams.edu

Annals of Ophthalmology (Skokie, Ill.)

|May 6, 2009

Summary

This summary is machine-generated.

Optic nerve head drusen (ONHD) can mimic bitemporal hemianopia, a condition typically associated with brain abnormalities. This case highlights ONHD as a crucial consideration in diagnosing visual field defects when brain imaging is clear.

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Area of Science:

Ophthalmology
Neuro-ophthalmology

Background:

Bitemporal hemianopia is a visual field defect often indicative of optic chiasm compression, commonly due to pituitary adenomas or other intracranial masses.
Differential diagnosis for bitemporal hemianopia typically includes neurological and endocrine disorders requiring neuroimaging.

Observation:

A 70-year-old male presented with a 5-week history of visual disturbance.
Clinical examination revealed bitemporal hemianopia and bilateral disc edema.
Ophthalmic testing identified bilateral optic nerve head drusen (ONHD).

Findings:

Optic nerve head drusen caused enlarged blind spots, clinically presenting as pseudo-bitemporal hemianopia.
The patient's visual field defect was attributed to ONHD, not a central nervous system lesion.

Implications:

Optic nerve head drusen should be included in the differential diagnosis for patients presenting with bitemporal hemianopia, especially when neuroimaging results are normal.
This finding underscores the importance of comprehensive ophthalmic examination in evaluating visual field defects to avoid unnecessary neurological investigations.