Pattern Electroretinography (pERG)

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What does it measure?

The pattern electroretinogram (pERG) measures retinal ganglion cell activity, estimates retinal function and quantifies the retinal response to light stimulation.

 

How is it measured?

A reversing checkerboard stimulus or contrast modulated grating pattern is used with no change in overall luminance over time (space-averaged luminance). Electrodes sum responses from the electrical potentials of the retinal ganglion cells.

 

Why is it important?perg

Retinal ganglion cell damage is the underlying cause of glaucoma-related decreases in visual sensitivity.  The pERG is particularly useful for detecting and monitoring this disease.