Before revision: alt=World Hearing Day logo|Logo World Hearing Day is a campaign held each year by Office of Prevention of Blindness and Deafness of the World Health Organization (WHO).
After revision: of the|221x221pxWorld Hearing Dayalt=World Hearing Day logo|Logo World Hearing Day is a campaign held each year by Office of Prevention of Blindness and Deafness of the World Health Organization (WHO).