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Br J Ophthalmol 1997;81:1043-1045 doi:10.1136/bjo.81.12.1043
  • Original Article
    • Clinical science

Normal S cone electroretinogram b-wave in Oguchi’s disease

  1. Shuichi Yamamotoa,
  2. Masanori Hayashia,
  3. Shinobu Takeuchia,
  4. Yutaka Shiraob,
  5. Katsutoshi Kitab,
  6. Kazuo Kawasakib
  1. aToho University Sakura Hospital, Sakura, Japan, bKanazawa University, Kanazawa, Japan
  1. Shuichi Yamamoto, MD, Department of Ophthalmology, Toho University Sakura Hospital, 564–1 Shimoshizu, Sakura, Chiba 285, Japan.
  • Accepted 1 May 1997

Abstract

AIM The short wavelength sensitive (S) cone electroretinograms (ERGs) were examined in two patients with Oguchi’s disease to study S cone function.

METHODS Ganzfeld colour flashes under bright white background illumination were used to elicit S cone, and mixed long (L) and middle (M) wavelength sensitive cone ERGs.

RESULTS The S cone ERG b-wave was normal with short wavelength stimuli with normal L and M cone responses in both patients.

CONCLUSIONS These ERG results indicate that the S cone system as well as the L and M cone system is not defective in Oguchi’s disease, while the S cone responses are not detectable in the complete type of congenital stationary night blindness as reported previously. The results imply that there is a significant difference in the way the S cone system is affected in different forms of stationary night blindness, and that the S cone and rod do not share the same arrestin system.

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