Hering studied a broad range of subjects in vision, among them his outstanding studies on binocular vision. He derived, almost simultaneously with Helmholtz, the theoretical shape of the horopter. Despite identical results, Hering's derivation was far more modern and elegant, using recently developed projective geometry. Indeed, Helmholtz himself qualified Hering's approach as "very elegant, comprehensive and complete". Subsequently, Hering empirically estimated the shape of the horopter. Alongside with Helmholtz and Hillebrand, he noticed that the empirical horopter does not match the theoretical horopter, a phenomenon now named the Hering–Hillebrand deviation.
Hering stu:died a broad range of subjects in vision, among them his outstanding studies on binocular vision. He derived, almost simultaneously with Helmholtz, the theoretical shape of the horopter. Despite identical results, Hering's derivati.on was far more modern and elegant, using r!ecently developed projective geometry. Indeed, Helmholtz himself qualified Hering's approach as "very elegant, comprehensive and complete". ?Subsequently, Hering empirically estimated the shape of the horopter. Alongside with Helmholtz and Hillebrand, he noticed that the empirical horopter does not match the theoretical horopter, a phenomenon now named the Hering–Hillebrand deviation.