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Detecting progressive visual field loss

D B Henson1, M N Darling

  • 1Department of Optometry and Vision Sciences, Cardiff University, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|September 1, 1995
PubMed
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Optometrists can now better assess visual field progression using new data on inter-test variability. This research establishes how variability changes with visual field loss for the Henson CFS2000 perimeter.

Area of Science:

  • Ophthalmology and Optometry
  • Clinical Vision Science

Background:

  • Shared care in optometry necessitates accurate visual field assessment for monitoring disease progression.
  • Inter-test variability in visual field testing can complicate the detection of glaucomatous changes.

Purpose of the Study:

  • To establish the relationship between inter-test variability and the extent of visual field loss.
  • To provide optometrists with data to aid in the interpretation of visual field changes over time using the Henson CFS2000 perimeter.

Main Methods:

  • Collected visual field data from 174 eyes (89 patients) over 2 years using the Henson CFS2000 perimeter with a supra-threshold strategy.
  • Analyzed 595 visual field records from patients with normal and glaucomatous visual fields.
  • Investigated the relationship between the number of missed stimuli and visual field loss extent.

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Main Results:

  • A significant relationship was found between increasing visual field loss and increased inter-test variability.
  • Analysis of missed stimuli at 5 dB or more above threshold revealed this increasing variability.
  • The established data quantify variability in relation to loss extent.

Conclusions:

  • The findings provide optometrists with crucial information to differentiate true visual field progression from natural variability.
  • These data enhance the reliability of visual field monitoring in shared care settings.
  • Optometrists can use this information to better assess the significance of changes in missed stimuli between patient visits.