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Observer experience and Cup:Disc ratio assessment.

S Hanson1, S K Krishnan, J Phillips

  • 1Department of Optometry and Vision Science, The University of Auckland, New Zealand.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|November 10, 2001
PubMed
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Observer experience significantly impacts interobserver agreement in Cup:Disc ratio estimation, with optometrists showing higher consistency. Intraobserver agreement, however, remains consistent across experience levels for Cup:Disc ratio assessments.

Area of Science:

  • Ophthalmology
  • Optometry
  • Medical Imaging

Background:

  • The clinical utility of the Cup:Disc (C:D) ratio relies on consistent observer agreement.
  • Investigating the influence of observer experience on C:D ratio estimation is crucial for diagnostic accuracy.

Purpose of the Study:

  • To evaluate how observer experience affects interobserver and intraobserver agreement in estimating the Cup:Disc ratio.
  • To compare agreement levels among optometry students and practicing optometrists.

Main Methods:

  • Nine 3rd-year students, nine 4th-year students, and nine optometrists estimated C:D ratios from 26 optic disc photographs.
  • Both monoscopic and stereoscopic viewing methods were employed.
  • Weighted kappa (Kw) analysis was used to assess observer agreement.

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Main Results:

  • Interobserver agreement increased with experience: optometrists (Kw=0.61) > 4th-year students (Kw=0.51) > 3rd-year students (Kw=0.39).
  • Stereoscopic viewing yielded higher C:D ratios and improved interobserver agreement compared to monoscopic viewing.
  • Intraobserver agreement showed no significant variation with experience (Opt=0.67, Yr4=0.66, Yr3=0.62).

Conclusions:

  • Observer experience does not influence the reproducibility of individual Cup:Disc ratio assessments (intraobserver agreement).
  • Increased observer experience significantly enhances the consistency of Cup:Disc ratio estimations between different observers (interobserver agreement).