Figure 2.

Electroretinogram responses from a normal subject (54-year-old male) and a glaucoma patient (61-year-old male). The arrow indicates stimulus onset. After the 250-msec stimulus, on (▾) and off (▽) responses were identified. The glaucoma patient had bilateral pseudophakia, best-corrected visual acuity in the tested eye (OD) was 20/25 with mild hyperopia (+0.5 diopter), and the intraocular pressure was 14 mmHg. The thickness of the retinal ganglion cell complex layer was 60 μm and mean deviation examined by perimetry was −21.1 dB. The disk/cup ratio was 0.82. Neither on nor off responses were observable on the waveform recorded from the glaucoma patient.