An international standard procedure for electroretinography (ERG) has finally been established. It represents a minimum protocol to record five basic signals (rod response, scotopic maximal response, oscillatory potentials, single-flash cone response, 30-Hz flicker response). Individual laboratories may continue to do additional or specialized procedures, but the hope is that all laboratories will include "standard" responses in their routine protocols so ERG data can be compared throughout the world for patient care and for research.