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M. E. Hajee, T. Brevetti, D. Lazzaro, B. Siesky, P. Chamnongvongse, A. Harris; Comparison of Retinal Blood Flow Between Healthy Blacks and Whites. Invest. Ophthalmol. Vis. Sci. 2007;48(13):2293.
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Previous studies have suggested that blood flow may be different amongst various races. This study examined the differences in the peripappillary retinal blood flow (PBF) of healthy white and healthy black populations.
Data for this study was obtained from healthy patients free of any pharmacological agents. We compared twenty-six eyes (13 black and 13 white) of healthy patients. Using images obtained from the Heidelberg Retinal Flowmeter, "pixel-by-pixel" analysis was done in an area adjacent to the optic disc with a minimum of 1600 pixels. Flow values were then divided into percentile flow with the removal of zero-flow values. Comparisons were made between groups by means of T-test.
Mean age of whites and blacks was 42 and 46.8 years respectively (p=0.53). Multivariate analysis revealed that PBF between the two groups showed no statistical significance between whites and blacks at the following percentile parameters:10th [8.95 vs.4.31, p=0.36], 25th [85.3 vs. 69.7, p=0.34], 50th [204 vs. 204, p=0.98], 75th [346.34 vs. 361, p=0.68] and 90th [538 vs. 559, p=0.72]. The mean intraocular pressure of white and black patients were 15.2 and 13.9 mmHG respectively (P=0.15).
The data suggests that in the healthy population there is no difference in the PBF between whites and blacks. There was so significant difference in age and intraocular pressure between the two groups.
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