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How large should an iridotomy be?
  1. Alexander C Day1,2,
  2. Paul J Foster1,2,3
  1. 1UCL Institute of Ophthalmology, London, UK
  2. 2Moorfields Eye Hospital, London, UK
  3. 3NIHR Biomedical Research Centre for Ophthalmology, UCL Institute of Ophthalmology and Moorfields Eye Hospital, London, UK
  1. Correspondence to Alexander C Day, UCL Institute of Ophthalmology, Bath Street, London EC1V 9EL, UK; alex{at}

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In 1990, Fleck calculated that an iridotomy of 10–15 μm diameter should theoretically prevent angle closure glaucoma due to pupil block.1 This was consistent with the required iridotomy diameter previously reported by Wheeler.2 Fleck used Navier–Stokes continuity equations and assumed an iris thickness of 50 μm. …

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