Macular pigment optical density measured by heterochromatic modulation photometry.

Although the individual photometric matches derived either from the modulation ratio for which sensitivity was minimal or from the differences in sensitivity at the asymptotes correlated well (r = 0.87 for central measurements and r = 0.76 for peripheral measurements, p<0.001 for both), the MPOD values calculated from the differences between the respective central and peripheral measurements did not reach statistical significance (r = 0.38, p = 0.069).

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