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  1. Roger Wolfs
  1. Department of Ophthalmology, Erasmus Medical Center, Rotterdam, The Netherlands
  1. Correspondence to Dr Roger Wolfs, Department of Ophthalmology, Erasmus Medical Center, PO Box 2040, Rotterdam 3000CA, The Netherlands; r.wolfs{at}

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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 …

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  • Linked articles 300787, 301081.

  • Competing interests None.

  • Provenance and peer review Commissioned; internally peer reviewed.

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