(a)
(b)
(c)
Figure 1: Nerve conduction velocity and choroidal thickness in early diabetic retinopathy. (a) Sural sensory conduction velocity (SCV) was lower in mild nonproliferative diabetic retinopathy (NPDR) patients than in no diabetic retinopathy (NDR) patients (). (b) Tibial motor conduction velocity (MCV) was lower in patients with mild NPDR than in patients with NDR (). (c) choroidal thickness was higher in patients with mild NPDR than patients with NDR, but with no significant difference (). Mann-Whitney U test: and ; NS: not significant.