ERGundersøkelse
ERG examination, or electroretinography, is a diagnostic test that records the retina’s electrical responses to light. It provides an objective measure of retinal function, especially the activity of photoreceptors, bipolar cells, and Müller cells. The test can be performed as full-field ERG (ffERG), which assesses the global retina, or in targeted forms such as multifocal ERG (mfERG) and pattern ERG (pERG) for localized or pathway-specific testing.
Procedure: After dilation and placement of an electrode on the eye, scotopic responses are recorded following
Indications: ERG is used to evaluate suspected hereditary retinal diseases (e.g., retinitis pigmentosa, cone-rod dystrophy), Leber
Risks and limitations: ERG is noninvasive with minimal risk; transient irritation from electrodes and bright light