The difference between belief and reality for Viktorin’s method of inter-pupillary distance measurement

Glyn Walsh, Edward Pearce

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The variation in the measurement of an inter-pupillary distance and monocular centration distance by 54 registered practitioners using a ‘pd rule’ was investigated. Their estimate of the repeatability of the measurement was also recorded, as was any correction for their own inter-pupillary distance. There was found to be considerable variation between practitioners in all measurements, and the practitioners’ estimated repeatability of the measurement was rather better than the reality.

Original languageEnglish
Pages (from-to)150-154
Number of pages5
JournalOphthalmic and Physiological Optics
Issue number2
Publication statusPublished - 1 Mar 2009


  • optometry
  • vision sciences

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