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In clinical electroretinography the extreme expression of rod- or cone dysfunction is found in the complete form of congenital total color blindness and in Schubert-Bornschein’s form of congenital night blindness. The ERG traces of both anomalies represent models for the analysis of rod- and cone function or dysfunction. Comparative studies of these conditions, first performed by Goodman & Bornschein, can enable investigators to gain a deeper insight into electrophysiology and patho-physiology of the eye.

Since 1952, when Schubert & Bornschein published the electroretinographic results of a subject with congenital night blindness, the specific anomalies of the ERG in these cases are well known: a-wave and x-wave are recordable, but the scotopic b-wave is completely absent. Up to now slow potentials of ERG were not studied in this form of night blindness.