Comparative campimetric and multifocal electroretinography (mfERG). Right eye (a) 10-2 and (b) 30-2 visual field view testing show deficits in retinal sensitivity to the central points of the stimuli. The mean deficits are 9.0 and 7.8 dB, respectively, compared with the contralateral normal eye (normal mean deficit: 0.5-2.0 dB). (c) Subnormal retinal response and reduction of the N1 and P1 wave amplitudes. The 61-hexagon 30° test had decreased by 75.0%, 41.9%, 27.0%, 10.5%, and 6.15%, respectively, from the <2-degree to >15-degree central rings compared to the normal control parameters (normal range of the mean deficit permitted is 1-3%). (d) mfERG as a 3-D topographic field map of the macular function shows subnormal foveal photoreceptor sensitivity with a normal spatial resolution, due to stable fixation and location pattern. Left eyes comparative normal figures of the left eye show (e) 10-2, (f) 30-2, and (g, h) mfERG within the normal range.