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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Frequency doubling technology threshold visual field results vary with software version.

Nagisa Kojima1, Shiroaki Shirato, Yuko Ohno

  • 1Department of Ophthalmology, Hachioji Medical Center, Tokyo Medical University, Tokyo, Japan.

Japanese Journal of Ophthalmology
|December 26, 2007
PubMed
Summary
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New frequency doubling technology (FDT) software (version 3.0) shows significant differences compared to the older version (2.6). These changes in visual field testing may impact glaucoma patient management and require updated normative data.

Area of Science:

  • Ophthalmology
  • Medical Technology
  • Visual Science

Background:

  • Frequency Doubling Technology (FDT) is a visual field testing method.
  • Assessing visual field changes is crucial for glaucoma management.
  • Software updates in medical devices can alter test results.

Purpose of the Study:

  • To compare visual field test results between two software versions of FDT.
  • To evaluate the comparability of FDT software version 3.0 against version 2.6.

Main Methods:

  • 100 glaucoma patients underwent duplicate FDT visual field tests.
  • Tests were performed using both FDT software version 3.0 and version 2.6 on the same eye.
  • Comparisons included test duration, mean deviation (MD), and pointwise sensitivity.

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Main Results:

  • FDT version 3.0 showed statistically significant differences from version 2.6.
  • Tests with version 3.0 were 14.2% faster and had a more negative average MD (-0.53 dB).
  • Version 3.0 yielded lower threshold estimates at 15 of 19 points and identified more abnormal results.

Conclusions:

  • Significant differences exist between FDT software versions 3.0 and 2.6.
  • These differences may influence clinical decisions in glaucoma care.
  • Updated age-corrected normal values and baseline data are recommended for FDT version 3.0.