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Letters
Spectral-domain optical coherence tomography in subjects over 60 years of age, and its implications for designing clinical trials
  1. Oliver Comyn1,2,
  2. Catey Bunce1,2,
  3. Praveen J Patel1,
  4. Caroline J Doré3
  1. 1 NIHR Moorfields Biomedical Research Centre, Moorfields Eye Hospital, London, UK
  2. 2 UCL Institute of Ophthalmology, London, UK
  3. 3 UCL Clinical Trials Unit, London, UK
  1. Correspondence to Oliver Comyn, NIHR Moorfields Biomedical Research Centre, Moorfields Eye Hospital, 162 City Road, London EC1V 2PD, UK; olivercomyn{at}doctors.org.uk

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We read with interest the paper by Caramoy et al recently published in the British Journal of Ophthalmology—our attention having been captured by the inclusion of clinical trial design in its title.1 Developments in stem cell treatments and the advent of anti-vascular endothelial growth factor treatments have very much placed ophthalmic clinical trials in the public arena. We feel however that the main conclusion drawn by the authors that ‘clinical trials using central retinal thickness as an endpoint are feasible in terms of sample size needed’ needs to be tempered in the light of the following issues.

  1. Power: Designing a clinical trial with 80% power means that there is a 20% chance of missing …

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