Fig. 2
From: NGF eye-drops topical administration in patients with retinitis pigmentosa, a pilot study
Macular focal ERG (fERG) changes following NGF treatment in the context of RP patient test–retest fERG variability. Black symbols correspond to the NGF treated patient (same patient-symbol association as in Fig. 1), gray circles are test–retest data from long term follow-up RP patients from the clinic database (N = 94 eyes from 47 patients). Dotted horizontal lines represent the 10 and 90th percentile of the test–retest data sample. Average test–retest time span 130 ± 76 days. Each patient is identified by the same symbol as in Fig. 1