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Related Experiment Video

Updated: Mar 20, 2026

Electroretinogram Recording for Infants and Children under Anesthesia to Achieve Optimal Dark Adaptation and International Standards
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Unilateral negative electroretinogram presenting as photophobia.

Ai Kido1, Ken Ogino2, Yozo Miyake3,4

  • 1Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, 54 Shogoin-Kawaharacho, Sakyo, Kyoto, 606-8507, Japan.

Documenta Ophthalmologica. Advances in Ophthalmology
|June 2, 2016
PubMed
Summary

Four patients experienced acquired unilateral negative electroretinogram (ERG) and severe photophobia. This study describes their unique clinical presentation and suggests a novel post-photoreceptor visual pathway dysfunction.

Keywords:
Normal fundusPeripheral cone–rod dysfunctionUnilateral negative ERGUnilateral photophobia

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Electrophysiology

Background:

  • Acquired unilateral negative electroretinogram (ERG) and severe photophobia are rare conditions.
  • Understanding the underlying pathology is crucial for diagnosis and management.

Observation:

  • Four patients presented with unilateral photophobia and a characteristic electronegative pattern on full-field ERG.
  • Ocular examinations revealed minimal structural changes despite significant functional deficits.

Findings:

  • The ERG showed preserved a-wave amplitude with reduced b-wave, indicating post-photoreceptor dysfunction in both rod and cone pathways.
  • Multifocal ERG demonstrated widespread but centrally preserved responses.

Implications:

  • These findings suggest a previously undescribed visual pathway disorder.
  • Further research is needed to elucidate the exact etiology and potential therapeutic strategies.