Ophthalmic Imaging Systems Inc. of Sacramento, Calif., will partner with International Vision Network, a Baltimore-based division of the International Physician Networks, and with AmerisourceBergen Specialty Group of Addison, Texas. The California company will become the only digital imaging system vendor for the vision network, which will endorse and offer discounts to its members on the systems, including ophthalmic PACS, fundus cameras and slit lamps.