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e·lec·tro·ret·i·no·gram (ERG),

A record of the retinal action currents produced in the retina by an adequate light stimulus.
[electro- + retina + G. gramma, something written]
Farlex Partner Medical Dictionary © Farlex 2012


(ERG) (ĕ-lek'trō-ret'i-nō-gram)
A record of the retinal action currents produced in the retina by an adequate light stimulus.
[electro- + retina + G. gramma, something written]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A recording of the summation of the electric changes occurring in the retina under different conditions, such as exposure to flashes of bright light. The ERG is of value in the diagnosis of some uncommon conditions affecting the RODS or the CONES.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

electroretinogram (ERG)

Recording of mass electrical response of the retina when it is stimulated by light. It is recorded by placing an electrode in contact with the cornea (often with the aid of a contact lens) or around the eye under the eyelid. A second electrode is placed either on the forehead or the face. The response is complex as many cells of various types contribute to it and varies according to whether the eye is dark or light adapted, the colour of the stimulus, the health of the retina, etc. The curve consists of two major components: a negative a-wave and a positive b-wave. The a-wave originates in the photoreceptors while the b-wave originates in the bipolar and Mueller cells. Both waves also have a photopic and a scotopic component.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
Salgarello et al., "Effect of epigallocatechin-gallate on inner retinal function in ocular hypertension and glaucoma: A short-term study bypattern electroretinogram," Graefe's Archive for Clinical and Experimental Ophthalmology, vol.
Oakley, K(+)-evoked Muller cell Depolarization Generates b-wave of Electroretinogram in Toad Retina, Proc.
Additionally, the patient underwent PERG and ERG electroretinograms according to the protocols recommended by the International Society for Clinical Electrophysiology of Vision (ISCEV) [4, 5].
Piermarocchi, "Carotenoids and antioxidants in age-related maculopathy Italian study: multifocal electroretinogram modifications after 1 year," Ophthalmology, vol.
The carnosic acid-treated rodents also exhibited better electroretinogram activity, a measure of healthy photoreceptor function.
ERG (electroretinogram) responses indicate that invisible flicker is transmitted through the retina, even up to 200 Hz (Berman,1991).
Diagnostic tools used include brain MRI, DNA analysis, measurement of sialic acid content, electroretinogram, and ultrastructural analysis of biopsied material.
We will also review the line of research focusing on the visual system, particularly involving the electroretinogram since it appears to be a cost-effective peripheral marker of dopamine dysfunction among cocaine-dependent patients.
Retinal function remained steady and normal with a less than 15 percent decrease in electroretinogram response.