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Bar graph of average pixel intensities for retinal flavoprotein autofluorescence (FA) from control volunteers in 3 age groupings. Three volunteers were included in each age group, with all volunteers within 1 to 2 years of the group’s average age. Control volunteers in the 25-year-old group had significantly less retinal FA than either the 45-year-old group (P = .04 ) or the 60-year-old group (P = .01). gsu, grayscale units.
