following the first recording of electroretinographic responses in man to a barred pattern by riggs and associates ( 1964 ) in normal and by lawwill ( 1973 , 1974 ) in clinical cases , the first striking observation of a complete loss of pattern electroretinogram ( perg ) after injurious section of the optic nerve by groneberg & teping ( 1980 ) has led to the conclusion that the perg originates from proximal retinal structures different from those responsible for the luminance electroretinogram ( lerg ) .
C0015392
optic
C0035298
retinal