an apparatus and method for simulating human ophthalmic artery for testing of ultrasound devices is disclosed , whereby two chambers are provided and are capable of being independently pressurized , one representing the intra - cranial space and the other representing extra - cranial space , and whereby a tube running through both chambers is provided , simulating the course of the ophthalmic artery and capable of being pressurized to stimulate arterial pressure . the apparatus is operated by pressuring both chambers , and pumping a blood - imitating fluid through the vessel in a pulsatile manner .