Fig. 3

The stimulus patterns and the multifocal photopic negative response (mfPhNR). a The stimulus patterns (a circular stimulus with a 5° radius centered on the fovea and a quarter of an annulus placed in the superotemporal, superonasal, inferotemporal, and inferonasal regions around the fovea) were used to elicit mfERGs. The radius of the inner border of the annulus was 5° and that of the outer border was 20°. b The representative waveforms of the mfERGs recoded from five sectors in right eye of a patient with glaucoma. We measured the multifocal B-wave (mfB-wave; P1–N1) from the first negative trough to the peak of the following positive wave. The mfPhNR was measured from the baseline to the negative trough at more than 70 ms from the stimulus onset