A major focus of the study of lens opacities in Barbados by Leske et al1 was the analysis of racial differences in the prevalence of lens opacity morphological features. The population is divided into self-defined groups of "black," "mixed" (black and white), "white," and "other." The prevalence of lens opacities was analyzed by all racial categories, and opacity type was compared between self-reported black and mixed groups.
McLeod SD. Racial Categorization in the Barbados Eye Study. Arch Ophthalmol. 1998;116(2):259-260. doi: