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Mean macular pigment optical density as a function of serum lutein and zeaxanthin concentrations in cystic fibrosis (CF) patients (●; n = 10; the “x” represents one CF patient who was taking a lutein supplement) and age-matched control subjects (○; n = 10). The linear regression equations fitted to all subjects were as follows: lutein, y = 0.126 + 0.0019x (r = 0.76); zeaxanthin, y = 0.171 + 0.0044x (r = 0.80).
