Pattern Electroretinography (PERG) and an Integrated Approach to Visual Pathway Diagnosis

The pattern electroretinogram (PERG) provides an objective measure of central retinal function, and has become an important element of the author's clinical visual electrophysiological practice. The PERG contains two main components, a positivity at approximately 50 ms (P50) and a larger negativity at approximately 95 ms (N95). The P50 component is affected by macular dysfunction with concomitant reduction in N95. The PERG therefore complements...