The relative advancement of colored surfaces is studied analytically with an assumption that this phenomenon is caused by small change in convergence of binocular sight introduced by the color. Proportional relation of the relative advancement to square of the observation distance is predicted from the assumption and confirmed by the experiments.
Existence of sight deflection of single eye vision is predicted from the results, which is verified by experiments. The experimental results of sight deflection showed good quantitative agreement with that of relative advancement.