I/R injury induced time latency in ERG waves. The implicit times (i.e. latency times) of a- and b-waves were measured at varying light intensities during ERG recording (n = 9) at 7, 14, 21, 28 and 35 days after I/R injury. Data represent mean ± standard error of a- or b- wave implicit times at each light intensity from both control and I/R eyes. Two-way ANOVA (analysis of variance) was applied with the Bonfferoni post-hoc test for statistical analysis. Asterisks indicate statistical differences (p < 0.05) between control and I/R eyes at each light intensity.