“…48 Thereby, early RGCs abnormalities may be detected by using PERG recording, whereas visual field sensitivity still is unaltered. 26,38,39,49,50 In ocular hypertension eyes, it also has been reported that despite normal perimetry, in vivo measurements of the inner retina thickness, obtained by optical coherence tomography (OCT), are correlated with PERG responses. 23 Similarly, RNFL thickness abnormalities by OCT have been described in LU subjects by Savini et al, 51 as being characterized by thickening limited to the temporal quadrant of the optic nerve.…”