Correlations between age and task performance. Age was weakly correlated with accuracy and reaction time. (A) The correlations between age and accuracy were not significant in control subjects. (B) In glaucomatous subjects, the correlations were only significant for dark targets (r = −0.488, P = 0.025). (C, D) The correlations between age and reaction time were significant for lights (r = 0.649, P < 0.001) and darks (r = 0.606, P = 0.001) in control observers (C) but not in glaucomatous observers (D) or in control observers that were >49 years old (C).