5 Contrast agents for use in surgical and medical imaging and visualization; fluorescent contrast agents for use in surgical and medical imaging and visualization; exogenous contrast agents for use in surgical and medical imaging and visualization; near-infrared contrast agents for use in surgical and medical imaging and visualization; exogenous near-infrared contrast agents for use in surgical and medical imaging and visualization; near-infrared contrast agents for use in surgical procedures; exogenous near-infrared contrast agents for use in surgical procedures; near-infrared contrast agents for use in medical imaging and visualization; exogenous near-infrared contrast agents for use in medical imaging and visualization; near-infrared contrast agents for use in real-time surgical imaging and visualization; exogenous near-infrared contrast agents for use in real-time surgical imaging and visualization, none of the foregoing being ophthalmic preparations, otorhinolaryngological preparations, or preparations for the treatment of inflammation.