Electroretinography

Electroretinography, is used to measure the electrical responses of various cell types in the Retina , including the Light-sensitive Cells ( Rods and Cones ) and the Ganglion Cells . Electrodes are placed on the Cornea and the skin near the Eye . During a recording, the patient is watching a standardized Stimulus and the resulting signal is interpreted in terms of its amplitude (voltage) and time course. Stimuli include flashes (flash ERG) and reversing checkerboard patterns (pattern ERG). Applications are predominantly in Ophthalmology , where the '''electroretinogram (ERG)''' is used for the diagnosis of various retinal diseases:

Retinitis Pigmentosa and related hereditary degenerations

Retinitis pigmentosa sine pigmento

Retinitis punctata albescens

Leber's congenital amaurosis

Choroideremia

Gyrate atrophy of the retina and choroid

Goldman-Favre syndrome

Congenital Stationary Night Blindness - ''normal a-wave indicates normal Photoreceptor s; absent b-wave indicates abnormality in the Bipolar Cell region.''

X-linked juvenile Retinoschisis

Achromatopsia

Cone dystrophies

Disorders mimicking retinitis pigmentosa

The Multifocal ERG is used to record separate responses for different retinal locations.

SEE ALSO

Electrooculography

International Society For Clinical Electrophysiology Of Vision

Visual Evoked Potential

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Electroretinography