THE CONCEPT of peripheral fusion was first introduced in ophthalmology by Hermann Burian.1 He demonstrated that identical objects imaged on peripheral disparate points of the retina can induce a fusional movement of the eyes which brings the images on corresponding points. The peripheral fusion may even be so strong as to break the fusion of images situated on the macular region; e. g., a point fixated with both eyes may be seen as two points when the periphery of the eyes is stimulated haploscopically by disparate stimuli.
In his first publication Burian mentions that the amount of stimulation exerted by the peripheral images depends on size and brightness of these images and on distance from the fovea. The farther the peripheral stimuli are from the fovea, the larger they must be. Burian, however, does not give experimental evidence for this contention. For this reason I deemed it useful to
WINKELMAN JE. PERIPHERAL FUSION. AMA Arch Ophthalmol. 1951;45(4):425-430. doi:10.1001/archopht.1951.01700010435009