electroretinogram

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e·lec·tro·ret·i·no·gram (ERG),

(ē-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]

e·lec·tro·ret·i·no·gram

(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]

electroretinogram

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.

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.

electroretinogram

the record obtained by electroretinography; abbreviated ERG.
References in periodicals archive ?
Positive and negative deflections in the off response of the electroretinogram in man.
Results of full-field electroretinogram Test a-wave amplitude ([micro]V) Dark-adapted 0.
The electroretinogram (ERG) is a noninvasive physiologic technique for recording electrical potentials from the retina in response to flashes of light.
Contribution of cone photoreceptors and post-receptoral mechanisms to the human photopic electroretinogram.
Carotenoids and antioxidants in age-related maculopathy italian study: multifocal electroretinogram modifications after 1 year.
The spectral sensitivity, irradiance sensitivity, and temporal resolution of the photoreceptors were determined electrophysiologically by recording electroretinograms (ERGs).
This type of modulation of ERG activity also has not been reported in the literature on electroretinograms in L.
Electroretinograms (ERGs) elicited by brief (10-ms) flashes of light from an LED were recorded from the dark-adapted lateral eye with corneal electrodes.
Following techniques described elsewhere (5), we mounted a crab on a rigid platform in an aquarium contained in a lightproof, shielded cage and, using corneal electrodes, recorded electroretinograms (ERGs) from their dark-adapted lateral eyes in response to 20-ms light flashes generated by a green LED.