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Frequency doubling perimetry using a liquid crystal display.

P G Spry1, M L Gibbs, C A Johnson

  • 1Discoveries in Sight, Devers Eye Institute, 1225 NE 2nd Ave, Portland, Oregon 92732, USA.

American Journal of Ophthalmology
|March 10, 2001
PubMed
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New liquid crystal window displays show similar agreement and variability to commercial Frequency Doubling Technology perimeters for contrast threshold measurements. These findings suggest interchangeability, though the liquid crystal window display has a smaller operating range.

Area of Science:

  • Ophthalmology
  • Visual Neuroscience

Background:

  • Frequency Doubling Technology (FDT) perimetry is a common method for assessing visual field defects.
  • New display technologies are being developed to improve visual field testing.

Purpose of the Study:

  • To compare contrast threshold measurements using a novel liquid crystal (LC) window display with a commercial FDT perimeter.
  • To evaluate the agreement and variability between the two display systems.

Main Methods:

  • 49 glaucoma patients and 49 normal controls were tested with both LC window and FDT systems.
  • Stimulus conditions and test strategies were identical; LC display had a ~30% smaller dynamic range.
  • Agreement was assessed using quadratic weighted kappa; variability was quantified by standard deviation.

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Main Results:

  • Between-display agreement was 0.66, with variability of 2.3 dB.
  • Within-display (test-retest) FDT variability was 3.2 dB, with agreement of 0.65.
  • Agreement and variability were comparable between the LC display and FDT.

Conclusions:

  • Contrast threshold measurements from the LC window display and FDT perimeter are largely interchangeable.
  • The LC window display's smaller operating range is a limitation.
  • Further development may enhance the LC display's utility in visual field testing.