Fusing the upper pictures requires 2 prism diopters of Fusional Convergence. Changing Fixation from upper to lower picture.. by Keystone View Co. — VisualArtsDB
Fusing the upper pictures requires 2 prism diopters of Fusional Convergence. Changing Fixation from upper to lower picture..
![[Washington] Irving's Grave, Sleepy Hollow, N.Y., U.S.A.](https://media.getty.edu/iiif/image/a9ca0339-2335-4ceb-bc09-65c08f1ee456/full/843,/0/default.jpg)
![[Men hauling sacks from ship to dock]](https://media.getty.edu/iiif/image/f30bf319-9c44-4d3e-af66-b7fe90bd7077/full/843,/0/default.jpg)
