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Mean outer retinal thickness (ORT) in healthy control subjects (white bar) and sickle cell patients (gray bar). Thickness was averaged among the central subfield (central 1mm diameter), parafoveal (0.5 to 3 mm eccentricity) and perifoveal (3 mm to 6 mm eccentricity) regions. Error bars represent standard error of the means. (**) denotes p < 0.01.
