Multifocal Electroretinography (mfERG)

mferg stimulusWhat does it measure?

The multifocal electroretinogram (mfERG) simultaneously light stimulates and measures bioelectrical signals generated from multiple regions of the retina. It is used to evaluate discrete functions across large areas of the retina and to diagnose and study retinal diseases.

 

 

 

mferg overlay

How is it measured?

It uses the same electrodes and amplifiers as conventional ffERG recording, and provides a topographical measure of retinal activity that can be compared with the patient's visual fields.

 

mferg hillWhy is it important?

The mfERG has helped neuro-ophthalmologists distinguish between diseases of the outer retina (affecting photoreceptors and/or bipolar cells) and diseases of the inner retina (ganglion cells) and optic nerve. Because the mfERG shows good repeat reliability, it can be used to follow the progression of retinal diseases.When combined with automated perimetry, the mfERG is a valuable tool for localization and differential diagnosis. When combined with mfVEP, mfERG can differentiate between organic and nonorganic causes of visual loss.