https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14257730Edit ImageSaveSaveEditCropCustom TextFusing the upper pictures requires 2 prism diopters of Fusional Convergence. Changing Fixation from upper to lower picture.. by Keystone View CoOriginal public domain image from Getty MuseumMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 618 px | 300 dpiLarge JPEG 3500 x 1803 px | 300 dpiBest Quality JPEG 6639 x 3420 px | 300 dpiFree DownloadFusing the upper pictures requires 2 prism diopters of Fusional Convergence. Changing Fixation from upper to lower picture.. by Keystone View CoMore