Related Experiment Video
Updated: Jul 15, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
Binasal visual field defects from simultaneous bilateral retinal infarctions in sickle cell disease
Michael Cusick1, Hassanain S Toma, Thomas S Hwang
1The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA.
Purpose:
To report a case of retinal occlusive disease producing binasal visual field defects in a patient with sickle cell (SC) disease.
Design:
Retrospective case report.
Methods:
A 21-year-old man with SC disease presented with binasal field defects and 20/20 acuity in each eye.
Results:
Initial ophthalmoscopy and fluorescein angiography revealed no abnormalities. Optical coherence tomography (OCT) demonstrated bilateral temporal inner retinal hyperreflectivity, and multifocal electroretinography (mfERG) confirmed retinal dysfunction. Several weeks later, ophthalmoscopy and angiography demonstrated macular arteriolar occlusive disease.
Conclusions:
Simultaneous bilateral macular occlusive events are uncommon in patients particularly with SC disease. Although the binasal field defects raised the suspicion of a process affecting the optic nerves, the OCT and mfERG proved essential in diagnosing retinal rather than optic nerve disease.
Related Concept Videos
Diabetic Retinopathy
Anatomy of the Eyeball

