Abstract: Apparatus is described to measure the pulsatile waveform caused by blood flow to the two ocular globes through which impairment of the blood flow in one internal carotid artery relative to the other is indicative of extracranial carotid occlusive disease.Specifically, apparatus comprising eye cups having an orifice therethrough adhering to the eye by vacuum means enable connective flexible tubing interior air channel access for pressure transducers to measure the ocular globe pulsations. The flexible tubing connecting the eye cup and transducer is additionally connected to a plurality of valves, vacuum pump, and regulator, whereby the regulator and the vacuum pump create a desired partial vacuum and, by means of valves, isolation of air channels between each ocular globe and respective transducer may be accomplished.