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Cluster analysis in visual field quantification.

B C Chauhan1, D B Henson, A J Hobley

  • 1Department of Optometry, UWIST, Cardiff, UK.

Documenta Ophthalmologica. Advances in Ophthalmology
|May 1, 1988
PubMed
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This study analyzed visual field clusters in normal and glaucoma eyes. Glaucoma eyes show superior field defects more often, suggesting clusters are useful for diagnosing visual field defects.

Area of Science:

  • Ophthalmology
  • Visual Science
  • Medical Imaging

Background:

  • Visual field defects are key indicators of glaucoma.
  • Understanding cluster patterns in visual fields aids in early detection and monitoring.

Purpose of the Study:

  • To investigate the characteristics and significance of visual field clusters in normal and glaucoma eyes.
  • To evaluate the utility of cluster analysis in quantifying visual field defects.

Main Methods:

  • Central visual fields of 2165 normal and 106 glaucoma eyes were assessed using a threshold-related suprathreshold strategy.
  • The impact of varying cluster radius on defect identification was analyzed.
  • Frequency and location of clusters were compared between normal and glaucoma groups.

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Main Results:

  • Approximately 13% of normal eyes exhibited clusters, often artifactual (e.g., angioscotoma, blind spot variations).
  • Glaucoma eyes showed a higher frequency of superior field clusters compared to normal eyes.
  • Cluster analysis demonstrated sensitivity and specificity for visual field defect quantification.

Conclusions:

  • Cluster analysis is a valuable tool for quantifying visual field defects in glaucoma.
  • Distinct cluster patterns in glaucoma eyes, particularly in the superior field, can aid diagnosis.
  • Weighted probability indices based on cluster analysis can improve visual field scoring.