Pattern Electroretinography (pERG)


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.