MPOD was not related to relational memory measures (all p’s > 0.4), nor was it related to dietary lutein + zeaxanthin (p > 0.1). MPOD was, however, related to serum lutein (r = 0.30, p = 0.002), dietary (r = 0.20, p = 0.03) and serum (r = 0.25, p = 0.007) beta-carotene, serum cryptoxanthin (r = 0.29, p = 0.007), and serum zeaxanthin (r = 0.22, p = 0.017). Bivariate correlations are summarized in Table 2.