Grounauer P A, Toi V V, Streiff E B
Klin Monbl Augenheilkd. 1977 Jun;170(6):821-3.
A short presentation is given of the instrument used for perceptive flicker and for macular ERG. A modified de Lange's curve is obtained (the trimodal curve) and a macular ERG response is obtained from stimulation within a theoretical angle of 46 minutes of are.