Table 1. Rates of reliable waveforms elicited by each ring in the visual field.

	Rate of reliable waveforms (%)
	All rings		R1		R2		R3		R4		R5		R6
	PR	PP	PR	PP	PR	PP	PR	PP	PR	PP	PR	PP	PR	PP
Average	71.6*	52.1	66	66	83.9	75	86.3	79.1	83*	61.9	64*	31.5	46.4*	16
Sterr	3.7	4.5	8.5	10	4.4	6	3.1	6.5	3.8	5.8	5.8	5.5	6.5	4.6

Sterr = standard error; PR = pattern reversal; PP = pattern pulse.

^*P < 0.05 PR compared to PP (one-way ANOVA).