Pattern Electroretinograms in Preperimetric and Perimetric Glaucoma

•There is no definite method to evaluate visual function in preperimetric glaucoma. •The retinal nerve fiber layer (RNFL) defect was associated with lower pattern electroretinogram (PERG) amplitude in preperimetric glaucoma. •There is good discriminating ability of PERG N95 amplitude in preperimetric glaucoma with RNFL defect Purpose To investigate whether visual function can be graded in detail using pattern electroretinogram (PERG) in...