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 ?
The effects of dopamine blockade on the human flash electroretinogram.
After 2 to 3 hours of dark adaptation, electroretinograms (ERGs) were obtained while animals were under sedation (ketamine hydrochloride: 11 mg/kg, xylazine: 2.
Long-term effect of laser-induced ocular hypertension on the cone electroretinogram and central macular thickness in monkeys.
Multifocal electroretinogram in mild to moderate essential hypertension.
An electroretinogram (ERG) can be used to assess whether a RVO is ischaemic or non-ischaemic.
Electroretinogram characteristics and the spectral mechanisms of the median ocellus and the lateral eye in Limulus polyphemus.
The effects of ischemic injury on retinal were evaluated by fundus examination, fundus fluorescein angiography, electroretinogram, cell counting of retinal ganglion cell (RGC), and measurement of the thickness of the retina.
1) Fundus fluorescein angiogram (FFA) and full-field electroretinogram (ERG) are normal, whereas results of multifocal ERG (mfERG) of the central retina are markedly reduced.
Lutein suppresses STAT3 activation by inflammatory cytokines and extracellular signal-regulated kinase activation, slowing DNA damage and preserving a-wave electroretinogram amplitude in mouse models [34].
18) Further assessment is essential, and includes electroretinogram (ERG) testing, which shows a classic pattern of reduced scotopic amplitudes and initial selective b-wave reduction consistent with inner retina damage.
The ophthalmoscopy and the electroretinogram (ERG) also confirmed the beneficial effects of Pycnogenol.