electroretinogram

(redirected from electroretinograms)
Also found in: Dictionary, Thesaurus, Encyclopedia.

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 ?
The electroretinogram (ERG) is a noninvasive physiologic technique for recording electrical potentials from the retina in response to flashes of light.
The push-pull action of dopamine The push-pull action of dopamine on spatial tunning of the monkey retina: The effects of dopaminergic deficiency and selective D1 and D2 receptor ligands on the pattern electroretinogram.
The effects of dopamine blockade on the human flash electroretinogram.
Abnormal electroretinogram in cocaine dependent patients: Relationship to craving.
Contribution of cone photoreceptors and post-receptoral mechanisms to the human photopic electroretinogram.
Abbreviations: ERG = electroretinogram, FDA = Food and Drug Administration, GABA = gamma-aminobutyric acid, INL = inner nuclear layer, IPL = inner plexiform layer, IrOx = iridium oxide, MPA = microphotodiode array, Pt = platinum, RP = retinitis pigmentosa.