Ragnar Arthur Granit ( Born 30 October , 1900 in RiihimÃ ki , Finland - died 31 March 1990 , in Stockholm , Sweden ) was a Finnish doctor and scientist who won the 1967 Nobel Prize in Physiology or Medicine for his work on the eye . Ragnar Arthur Granit ( October 30 , 1900 , RiihimÃ ki , Finland â `` March 12 , 1991 , Stockholm , Sweden ) was a Finnish\/Swedish scientist who was awarded the Nobel Prize in Physiology or Medicine in 1967 along with Haldan Keffer Hartline and George Wald .