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Impression cytology: implications for ocular surface squamous neoplasia
  1. Anu Mathew,
  2. Thomas Stumpf,
  3. Charles McGhee
  1. Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
  1. Prof Charles McGhee, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland 2001, New Zealand; c.mcghee{at}auckland.ac.nz

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We read, with great interest, Singh et al.’s1 perspective on impression cytology and its uses in diagnosing ocular surface pathology. The known higher exposure to UV radiation in both Australia and New Zealand, and the increased incidence of ocular surface squamous neoplasia (OSSN) in Australia,2 3 recently led us to audit the incidence of OSSN in conjunctival biopsies in New Zealand over a 6-year period.

We identified 132 invasive conjunctival and/or corneal biopsies performed on 115 patients at Auckland City Hospital. Among the many histopathological diagnoses, 6% of patients had no histological abnormality, …

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