Fig. 2

Pain perception during and after vitreoretinal surgery under sub-Tenon anesthesia on the visual analogue scale (VAS) and the Wong-Baker FACES scale. Median is indicated with horizontal line the box. Bottom of the box represents 1st quartile, top 3rd quartile. Whiskers indicate 10th to 90th percentile. Outliers are indicated with staggered black circles and squares, respectively. *P = < 0.05