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Repeatability of ocular resonance Raman measurements. Two individuals had five repeated sessions of resonance Raman measurement of macular carotenoids over a 2-week period through the fully dilated pupil of the same eye in each patient. The mean ± standard deviation (SD) of peak height at 1525 cm−1 is given for the best three of five readings. The filled circles were obtained from a 26-year-old white male, and the open circles were obtained from a 37-year-old Asian male.
