Recording multifocal electroretinograms with fundus monitoring

Mineo Kondo, Yozo Miyake, Masayuki Horiguchi, Satoshi Suzuki, Atsuhiro Tanikawa

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Purpose. To record multifocal electroretinograms (ERGs) with simultaneous fundus monitoring. Methods. An infrared television fundus camera was used to monitor the fundus. A tightly packed array of 19 yellow light-emitting diodes (LEDs) was used as the stimulus source and LEDs were altered between on and off according to a binary m-sequence at a rate of 75 Hz. The stimulus array subtended approximately 25°of the visual angle. Multifocal ERGs were recorded with a Burian-Allen bipolar contact lens electrode from two normal subjects and a patient with macular dystrophy. Results. When the center of the stimulus was positioned on the fovea, the amplitude of the response was largest at the fovea and decreased toward peripheral retina; the response pattern corresponded to the spatial distribution of cone cells. When the center of the stimulus was positioned on the optic disc, the response at the optic disc was undetectable. A reliable multifocal ERG was obtained from a patient with macular dystrophy. Conclusions. This system made it possible to monitor the stimulus on the fundus and to adjust the stimulus to the correct retinal locations with exact focusing. The authors' findings indicate that this method especially can be useful in patients with poor fixation. In addition, the authors' results suggest that the stray light effect in the multifocal stimulus system is minimal if any.

Original languageEnglish
Pages (from-to)1049-1052
Number of pages4
JournalInvestigative Ophthalmology and Visual Science
Volume38
Issue number5
Publication statusPublished - 01-01-1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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