bData taken from Thylefors et al.2 c'his represents an average number of working years lost due to blindness for all causes and the actual number of years may be lower.dGiven by GNP per capitax (1 .03)0-1ofor adult blindness and GNP per capitax (1 03)0-50 for childhood blindness.eGiven by GNP per capitax (1 03)0-"'Xnumber of blind adults and GNP per capitax (1 03)0-10x number of blind children.fThis column is obtained by multiplying column (e) by 0-75 the total cost of adult blindness and by 0-5 the total cost of childhood blindness.
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Smith et al. (1996) studied this question.