[Functional exploration of the perimacular and macular retinal region by means of flicker E.R.G. and the determination of perceptive fusion thresholds of an intermittent light (De Lange's curve)].

This study compares and verifies the efficiency of two functional tests based on intermittent light stimulation. One is the De Lange curve, the other flicker E.R.G. recorded in defined photopic conditions and analysed with different methods. The studied cases belong to a reference group and other groups including foveolar lesions, parifoveolar and diffuse retinopathy, ethambutol and quinoline derivative retinal intoxication. The results show that both objective and subjective methods are sensitive and show some parallelism : both methods aid in distinguishing between foveolar and perifoveolar involvements; a possible comparison between the two tests is also possible.