Worldwide, an estimated 40 million people are blind. Cataracts account for at least half of the blindness. In Cambodia, being without sight is difficult and dangerous. In many rural areas, the only way pedestrians can cross rivers, is by using railroad bridges. Oncoming trains present an obvious hazard, but just crossing the bridge's open steel framework on unsecured planks is difficult enough, even for the sighted. Working for the Seva foundation, "KC" Kumar, a Nepalese ophthalmologist, has a vision to change things. Seva, a Berkley based humanitarian organization, has played a vital role in international efforts to reduce avoidable blindness. Recently Seva began work in Cambodia, developing methods to restore sight to cataract-blind people, and to build comprehensive, sustainable blindness prevention programs.