Fig. 4From: NGF eye-drops topical administration in patients with retinitis pigmentosa, a pilot studyBest corrected visual acuity (BCVA) changes following NGF treatment in the context of RP patient test–retest BCVA variability. Black symbols correspond to the NGF treated patient (same patient-symbol association as in Fig. 1), gray circles are test–retest data available from long term follow-up RP patients in the clinic database (N = 35 eyes from 18 patients). Dotted horizontal lines represent the 10 and 90th percentile of the test–retest data sample. Average test–retest time span 130 ± 71 days. Each patient is identified by the same symbol as in Fig. 1 Back to article page