What is multifocal Electroretinogram?

What is multifocal Electroretinogram?

The multifocal electroretinogram (mfERG) technique allows local ERG responses to be recorded simultaneously from many regions of the retina. As in the case of the full-field ERG, the ganglion cells contribute relatively little to the response, which originates largely from the outer retina.

What is a multifocal ERG?

Multifocal ERG uses visual stimuli from a computer screen to elicit electrical responses from different areas within the retina. The electrical energy created is measured by the Diopsys® mfERG vision test, and used to create a report for your doctor. It is similar to an EKG, but for your eyes.

What is ERG retina?

Definition. The electroretinogram (ERG) is a diagnostic test that measures the electrical activity of the retina in response to a light stimulus. The ERG arises from currents generated directly by retinal neurons in combination with contributions from retinal glia.

What does full field ERG measure?

Introduction. The full-field electroretinogram (ffERG) is an ophthalmologic test that provides non-invasive objective quantitative measures of the electrical activity in the retina. The ffERG represents an electrical response from the retina to a flash of light and measures global retinal function.

What can an erg diagnose?

Your doctor may perform an ERG to determine if you have an inherited or acquired disorder of the retina, such as:

• retinitis pigmentosa, which is a genetic disease causing loss of peripheral and night vision.
• macular degeneration, which is a loss of vision due to the death of cells in the macula.

What is pattern Electroretinogram?

The pattern electroretinogram (PERG) is an electrophysiologic ophthalmologic test that provides non-invasive objective, quantitative measurement of central retinal function. It objectively measures functional loss and recovery.

How long does an ERG test take?

The test takes about 1 hour to perform.

What can an ERG diagnose?

What happens during an ERG?

During an ERG recording session, the patient looks into a bowl displaying different amounts of light. Retinal cells emit small electrical signals when stimulated by certain types of light. The ERG machine records the resulting electric signals’ amplitude (voltage) and time course.

Which is the best way to interpret multifocal ERG?

Therefore, topographic abnormalities (via a three-dimensional distribution map) are useful for the interpretation of multifocal ERG in diseased patients. The latencies of the waveforms appear to be most consistent in the normal population.

Can a multifocal ERG help exclude Stargardt’s disease?

The central peak and paracentral mfERG responses (rings 1 to 3) are markedly attenuated even in cases of preserved central vision. Correlatively, a normal multifocal ERG can help exclude Stargardt’s disease. Figure 4.

What is multifocal electroretinography used for in practice?

Multifocal ERG in Practice. Multifocal electroretinography (mfERG) is most useful in solving the common puzzle of a patient with poor vision who has a normal appearing retina.

Which is the most recent advance in Erg technology?

The most recent advance in ERG technology is the multifocal electroretinogram (mfERG). The mfERG provides a detailed assessment of the health of the central retina.