[First communication: normal values of horizontal breadth fusion for distance vision (author's transl)].

Binocular fusion at 33 cm needs a fusion force of about 18 pdpt (delta) in convergence. In serial investigations on more than 2500 patients with normal binocular vision the fusion force is found to be limited to: in convergence max. 15.8 +/- 7.4 delta, in spontaneous convergence +18.8 +/- 5.3 delta, in divergence-5.6 +/- 2.3 delta. That seems to demonstrate, that in normal binocular vision with normal fusion force and without any subjective trouble the visual point must not be exactly in the foveolae of both eyes.