Abstract: An ultrasonic, non-contact tonometer for measuring the intraocular pressure (IOP) of an eye utilizing a single ultrasonic beam of appropriate frequency and power which simultaneously accomplishes both an ocular deformation and its measurement is provided comprising an ultrasonic transducer assembly, utilizing either a traditional head rest or a goggle-type adapter for precisely reproducible positioning of the transducer assembly relative to the eye allowing for distance and alignment adjustments, and an electronic section for signal processing, quality of precision monitoring and for the direct display of the IOP reading.