Karl Ewald Konstantin Hering was a German physiologist who did much research in color vision, binocular perception, eye movements, and hyperacuity. He proposed opponent color theory in 1892. Wikipedia
Born: August 5, 1834, Gersdorf, Germany
Died: January 26, 1918 (age 83 years), Leipzig, Germany
Children: Heinrich Ewald Hering
Parents: Ewald Hering