May 2004
Volume 45, Issue 13
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ARVO Annual Meeting Abstract  |   May 2004
The Scalar Product and oscillatory potentials (OPs) of multi–focal electroretinograms (mf–ERG) in normals and patients with optic disc atrophy
Author Affiliations & Notes
  • A. Kamei
    Ari Eye Clinic, Mizusawa, Japan
  • E. Nagasaka
    Mayo Corporation, Inazawa, Japan
  • Footnotes
    Commercial Relationships  A. Kamei, None; E. Nagasaka, None.
  • Footnotes
    Support  none
Investigative Ophthalmology & Visual Science May 2004, Vol.45, 241. doi:
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      A. Kamei, E. Nagasaka; The Scalar Product and oscillatory potentials (OPs) of multi–focal electroretinograms (mf–ERG) in normals and patients with optic disc atrophy . Invest. Ophthalmol. Vis. Sci. 2004;45(13):241.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Abstract: : Purpose:To evaluate the interrelation of mf–ERG, especially the second order kernel response (2nd–OKR) and OPs in the nasal and temporal visual fields in normals and patients with optic disc atrophy. Methods:Fifteen volunteers for the 2nd–OKR, fourteen for OPs and three patients with optic atrophy were tested. The m–ERG was recorded with the VERIS Science 5.0.4 System. The visual stimulus was made up of 37 hexagons in about a 40–degree visual field. It was pseudo–randomly alternated at 75 Hz between black (5cd/m2) and white (200cd/m2) for the 2nd–OKR and at 18.75 Hz between black (5cd/m2) and white (200cd/m2) for OPs, on the CRT monitor. The Burian–Allen ERG Electrodes, Adult–bipolar or Pediatric–bipolar, were used. Recording time was about 8min. with dilated pupils having the best–corrected visual acuity. For the Scalar Product, which reflects the amplitude of m–ERG, each trace of 2nd–OKR was analyzed in the 6 hexagons in the 5–degree area. For OPs, the peak amplitude of the 2nd OKR was analyzed in the same area where the Scalar Product was analyzed. Results:The Scalar Product was significantly larger in the temporal visual field (nasal retina) than the nasal visual field (temporal retina). In affected eyes of the patients, the nasal–temporal asymmetrical response was not found. On the other hand, the peak amplitude of OPs was significantly larger in the nasal visual field (temporal retina) than the temporal visual field (nasal retina). In affected eyes, the peak amplitude of OPs tended to decrease at the area where visual field defects. Conclusions:The Scalar Product appears higher in the temporal visual field, lower in the nasal. OPs have opposite characters, higher in the nasal visual field, lower in the temporal. Both the Scalar Product and OPs might reflect the function of the retinal ganglion cell at least at the central 5–degree visual field.

Keywords: neuro–ophthalmology: optic nerve • visual fields • electroretinography: clinical 
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