Hermann Ludwig Ferdinand von Helmholtz
Born: August 31, 1821
Died: September 8, 1894
Biography: Hermann Ludwig Ferdinand von Helmholtz was a German physician and physicist who made significant contributions to several widely varied areas of modern science. In physiology and psychology, he is known for his mathematics of the eye, theories of vision, ideas on the visual perception of space, color vision research, and on the sensation of tone, perception of sound, and empiricism.