Correlating the lutein optical density to zeaxanthin optical density we find that the higher levels of zeaxanthin were associated with lower levels of lutein, however this association was very weak and did not reach statistical significance (Pearson correlation r = −0.32; p = 0.08). 4.
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Macular Pigment Reflectometry: Developing Clinical Protocols, Comparison with Heterochromatic Flicker Photometry and Individual Carotenoid Levels.
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