5 matching records for REFRACTOR.
An electrically-powered ophthalmic device intended to be placed in front of a patient's eyes to assist with measuring the refractive error of the eye (the inaccuracies of focusing light upon the retina) during an examination, typically to determine a patien...
An electronic device used to apply visual stimuli (e.g., shifting patterns of light) to a patient's eyes. This device typically presents light to the eye through an optical system (optical stimulator), or light is viewed directly from an illuminated screen ...
A manually-operated ophthalmic device intended to be placed in front of a patient's eyes to assist with measuring the refractive error of the eye (the inaccuracies of focusing light upon the retina) during an examination, typically to determine a patient's ...
An assembly of devices designed to treat chronic, intractable (drug refractory) nausea and vomiting secondary to gastroparesis through gastric electrical stimulation (GES) of the lower stomach (antrum). The assembly typically includes a battery-powered impl...
A hermetically-sealed, battery-powered device implanted beneath the skin to produce electrical signals delivered to the heart via implantable cardiac pacing leads during the ventricular absolute refractory period (ARP) to enhance the strength of the heart [...