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Related Experiment Videos

Digit preference in Goldmann applanation tonometry: the hedgehog effect.

A J Buller1, K Chatzinikolas, N Giannopoulos

  • 1Blackpool Victoria Hospital, Blackpool, United Kingdom. alexbuller@mac.com

American Journal of Ophthalmology
|September 6, 2005
PubMed
Summary
This summary is machine-generated.

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Digit preference bias affects Goldmann applanation tonometer intraocular pressure measurements. This subconscious bias persists even when clinicians are aware, potentially impacting clinical decisions and trial outcomes.

Area of Science:

  • Ophthalmology
  • Clinical Measurement Science

Background:

  • Digit preference, a subconscious bias, influences numerical data collection.
  • Understanding this bias is crucial in medical measurements, particularly in ophthalmology.

Purpose of the Study:

  • To investigate digit preference in intraocular pressure (IOP) measurements.
  • To assess the influence of digit preference using the Goldmann applanation tonometer (GAT).

Main Methods:

  • Prospective study design with masked and unmasked phases.
  • Data collected from 6 ophthalmologists in general ophthalmic clinics over 2 months.
  • Analysis focused on the proportion of even numbers in IOP readings.

Main Results:

  • In the masked phase, 555 of 917 IOP readings (59.9%) were even (P = .075).

Related Experiment Videos

  • In the unmasked phase, 679 of 1056 IOP readings (64.3%) were even (P = .022).
  • A statistically significant digit preference for even numbers was observed in the unmasked phase.

    • Conclusions:

    • Digit preference significantly influences IOP measurements obtained with the Goldmann applanation tonometer.
    • This bias remains evident even when observers are aware of digit preference.
    • The findings suggest potential implications for clinical decision-making and the validity of trial results.