The contribution of vision to traffic accident involvement is examined in this paper. The evidence suggests that the vision test scores so far investigated are of little practical value in predicting accident risk. As finances available for road safety improvement are limited by the community, measures aimed at reducing the number and severity of traffic accidents need to be assessed in terms of their relative costs and benefits. It is concluded that a greater return in accident reduction will be achieved by concentrating on significant, identifiable human factors like alcohol rather than on driver vision.