• Glaucoma
• epidemiology

As we mentioned in our manuscript, there were some limitations in our study.1 The per-operative measurements were performed by two different observers, and observer 2 was trained by observer 1. In this way we think inter-observer variability will be minimal. In our analyses stratification by observer did not shown any statistically significant differences, and in the multivariate models surgeon (= observer) did not play a significant role, as …