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Definition : Visual evoked potential recorders designed for detecting, amplifying and recording the transient change of the electrical potential on or near the surface of the cornea to a reference distal point on the body, following stimulation of the retina by external repetitive stimuli. The results may be displayed as a graphic of the measured voltages vs. time (an electroretinogram); the graph usually shows the a-wave is the first large negative component, followed by the b-wave which is corneal positive and usually larger in amplitude. These recorders typically consist of detachable electrodes usually placed on the cornea (e.g., similar to a contact lens) and on the skin near the eyes; signal amplifiers; filters (to suppress interference); memory (e.g., electronic, optical/magnetic disc); and a display. The recorder may include capabilities to deliver external stimuli (e.g., reversible checkerboard patterns, flashlights) at an appropriate repetitive level to elicit the bioelectric response needed for recording. Electroretinographs are mainly used in studies intended to diagnose acquired and/or inherited retinal diseases, including retinitis pigmentosa. Recorders with additional capabilities for recording the velocity of the short, fast movements of the eyes made during reading and sleep (i.e., saccadic velocity) are also available.

Entry Terms : "ERGs"

UMDC code : 11482

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Data Sciences International

Company Type: Parent

Data Sciences International (DSI) has pioneered the use of wireless implantable devices for monitoring and collecting physiological data to become the global leader in implantable telemetric physiologic monitors. Our technology is the gold standard for monitoring vital signs in animals, which plays an important role in delivering health care to people. In fact, DSI plays an important role in improving the safety of new life-saving pharmaceuticals by providing highly accurate measurements of blood pressure, ECG, EEG, temperature, and activity from animals used to study the effects of these compounds.

LKC Technologies Inc

Company Type: Parent

LKC Technologies, Inc. is the worldwide leader in the visual electrophysiology field with products in over forty countries. Our products are used to diagnose a large number of ophthalmic conditions by measuring evoked potentials, including ERG, EOG, and VEP, dark adaptometry and more.

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