electroretinogram
Pronunciation: ih-lek-troh-RET-in-oh-gram
Also written as: ERG
A diagnostic test measuring electrical activity of the retina in response to light stimulation.
Full Definition
An electroretinogram (ERG) is a neurophysiological test that measures the electrical responses generated by neural and non-neural cells in the retina when stimulated by light. The test involves placing electrodes on or near the eye and recording the electrical activity in response to flashes of light of varying intensities and frequencies. ERG is crucial for diagnosing retinal disorders, hereditary retinal dystrophies, and monitoring retinal toxicity from medications. The test provides information about the function of different retinal cell layers including photoreceptors, bipolar cells, and ganglion cells. Different ERG protocols can isolate rod versus cone function.
Usage
Usage note: Commonly abbreviated as ERG in clinical contexts; distinguish from other ocular electrophysiology tests.
In Context
- "The full-field ERG revealed reduced rod and cone responses consistent with retinitis pigmentosa." — Ophthalmology consultation
- "Multifocal electroretinogram testing showed focal macular dysfunction in the affected eye." — Retinal specialist report