Introduction
Electrophysiology is the study of the electrical nature of biological cells and tissues. It is the basis of several ophthalmological techniques that can provide information about the retinal function. Three distinct electrical potentials have been identified in retina viz. Early receptor potential (ERP), electroretinogram (ERG), and electrooculogram (EOG). ERP is generated by the photopigment molecules in the outer part of visual receptors. ERG extends from pigment epithelium to the inner nuclear layer. EOG is a function of pigment epithelium but also depends on outer and inner layers of the retina.
ERG arises in the retina after light stimulation and ...