Curvature of binocular visual space. A modified method of right triangle

A modified method of right triangle was proposed to estimate curvature of binocular visual space, as the empirical relation between the physical and visual spaces. Four experiments were reported and three conclusions were drawn from the results: the locus of apparent equidistance lies between the physically equidistant curve and the Vieth-Müller circle; visual angle is overestimated; the curvature is dependent on both angular separation of light points and their viewing direction.