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  1. S Binder,
  2. B Wimpissinger,
  3. L Kellner,
  4. W Brannath,
  5. K Krepler,
  6. U Stolba,
  7. C Mihalics
  1. Krankenanstalt Rudolfstiftung, LBI for Retinology and Biomicroscopic Laser Surgery, Vienna 1030, Austria
  1. Correspondence to Professor S Binder, Department of Ophthalmology Krankenanstalt Rudolfstiftung, LBI for Retinology and Biomicroscopic Laser Surgery, Juchgasse 25, Vienna 1010, Austria; susanne.binder{at}wienkav.at

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In response to the letter of Sinha et al1 concerning our article “23 Gauge versus 20 Gauge System for Pars Plana Vitrectomy: A Prospective Randomised Clinical Trial” we would like to publish the following answer:

For analysis of postoperative pain, we used a simplified verbal rating scale (ranging from 0, meaning no pain, to 3, meaning severe pain). The standardised verbal rating scale ranges from 0 (no pain) to 10 (“the worst pain possible”), which we think is too extensive for our patients and purpose.

In the literature, verbal rating scales are described to be a valid, reliable and appropriate tool for determination of postoperative pain in clinical practice1 2 Furthermore, we believe that the assessment of postoperative pain is not likely to be biased, if the assessor is not masked, because the perception of pain is a completely subjective parameter and is not likely to be influenced, if the …

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