Study of Blue and Red Flash in Dark-Adapted Electroretinogram.
10.3341/kjo.2005.19.2.106
- Author:
Sang Hyun LIM
1
;
Young Hoon OHN
Author Information
1. Department of Ophthalmology, Soonchunhyang University College of Medicine, Bucheon, Korea. eyedrlim@paran.com
- Publication Type:Original Article
- Keywords:
Blue light;
Dark-adapted electroretinogram;
Red light;
X-wave
- MeSH:
Adolescent;
Adult;
Child;
Dark Adaptation/*physiology;
*Electroretinography;
Female;
Humans;
Male;
Middle Aged;
Photic Stimulation/*methods;
Retina/*physiology
- From:Korean Journal of Ophthalmology
2005;19(2):106-111
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: To investigate the characteristics of the waveform generated by blue and red light stimulations in a dark-adapted electroretinogram (ERG) and those of cone responses in the dark-adapted condition. METHODS: The study subjects were 52 persons (88 eyes) with no previous medical history. The author recorded b-waves (rod response) with red light stimulation and the x-waves (dark-adapted cone response) that appeared before the b-waves. The author also recorded b-waves with blue light stimulation, which had the same amplitude as the b-waves from the red light stimulation. The differences with respect to age and gender were studied. Waveforms of the dark-adapted cone ERGs were recorded by using a digital subtraction technique. RESULTS: The x-wave always appeared before the b-wave with 0 dB (2.4 cd.s/m2) red stimulation. With blue stimulation, a b-wave equivalent to the b-wave stimulated with the red light of 0 dB intensity appeared at an average of -14.57 dB. The implicit time for the b-wave was delayed significantly for the male group. There were no significant differences between different age groups. The dark-adapted cone ERG demonstrated the waveform of a negative response followed by a series of oscillatory potentials (OPs) and a positive response. CONCLUSIONS: The cone responses were followed by the rod responses with red light stimulation of 0 dB in the dark-adapted ERG. The waveforms of the cone ERGs were obtained in dark adaptation with red and blue light stimulation.
