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  • Title: Dependence of cone b-wave implicit time on rod amplitude in retinitis pigmentosa.
    Author: Birch DG, Sandberg MA.
    Journal: Vision Res; 1987; 27(7):1105-12. PubMed ID: 3660664.
    Abstract:
    Computer-averaged full-field rod and cone electroretinograms (ERGs) were evaluated in 63 patients with retinitis pigmentosa and 116 normal subjects. Cone b-wave implicit times to 30 Hz white flicker and to 1.0 Hz white flashes on a white background were both inversely proportional to the log amplitude of the dark-adapted rod b-wave, even when controlling for the log amplitude of the dark-adapted cone b-wave. Cone ERGs were also obtained from a subset of 12 patients with retinitis pigmentosa in the presence of photopically-matched red and blue backgrounds that allowed direct assessment of the effect of rod function on cone b-wave implicit time in the patients. The effectiveness of the blue background in reducing cone b-wave implicit time relative to that obtained with the red background varied with the amplitude of the rod ERG. The results of both experiments suggest that delays in cone b-wave implicit time obtained with 30 Hz white flicker or with background adaptation in patients with retinitis pigmentosa are due, at least in part, to rod disease.
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