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Inter-observer variation in clinical optic disc biometry

A A Pyott1, D M Montgomery

  • 1Department of Ophthalmology, Southern General Hospital, Glasgow, UK.

Eye (London, England)
|January 1, 1993
PubMed
Summary
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This study assessed the optic nerve head measurements using a clinical optic disc biometer. The biometer showed good reproducibility but had conflicting interpretations for discs with unclear boundaries.

Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biometry

Background:

  • Accurate measurement of optic nerve head (ONH) parameters is crucial for diagnosing and monitoring glaucoma.
  • Clinical optic disc biometers aim to provide objective and reproducible ONH measurements.

Purpose of the Study:

  • To evaluate the inter-observer reproducibility of measurements obtained with a clinical optic disc biometer.
  • To assess the reliability of the biometer's automated interpretation of optic disc status (normal, suspicious, glaucomatous).

Main Methods:

  • Two independent observers performed measurements on 84 eyes from 47 patients using the clinical optic disc biometer.
  • The instrument utilizes a modified indirect ophthalmoscopy technique.
  • Inter-observer differences for various ONH parameters (diameters, areas) were calculated.

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Main Results:

  • Median inter-observer differences were small, ranging from 0.078 mm to 0.225 mm² for different parameters.
  • The biometer produced conflicting interpretations in 8 discs.
  • Conflicting interpretations were predominantly observed in discs with indistinct boundaries.

Conclusions:

  • The clinical optic disc biometer demonstrates good inter-observer reproducibility for ONH measurements.
  • The automated interpretation feature may be unreliable for optic discs with indistinct margins, highlighting the need for careful clinical correlation.