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Evaluation of the Humphrey FASTPAC threshold program in glaucoma
C O'Brien1, D Poinoosawmy, J Wu
1Glaucoma Unit, Moorfields Eye Hospital, London.
The British Journal of Ophthalmology
|July 1, 1994
Summary
The new FASTPAC visual field test is 35% faster than the standard program for glaucoma patients. However, it is less accurate in measuring visual field loss, potentially impacting diagnosis.
Area of Science:
- Ophthalmology
- Visual electrophysiology
Background:
- Prolonged perimetry can lead to patient fatigue and reduced test performance.
- The Humphrey visual field analyzer is a standard tool for assessing glaucoma progression.
Purpose of the Study:
- To compare the performance of a new rapid thresholding program, FASTPAC, with the standard Humphrey visual field analyzer program (24-2).
- To evaluate the accuracy and efficiency of FASTPAC in glaucoma patients.
Main Methods:
- A comparative study involving 44 glaucoma patients.
- FASTPAC program was tested against the standard Humphrey program 24-2.
- Key metrics analyzed included test time, mean deviation (MD), corrected pattern standard deviation (CPSD), short-term fluctuation, and reliability indices.
Main Results:
- FASTPAC significantly reduced mean test time by 35% (12.6 to 8.2 minutes).
- FASTPAC underestimated MD (p=0.007) and CPSD (p=0.005) compared to the standard program.
- Measurement errors were consistent across early and advanced visual field loss.
- No significant differences were observed in short-term fluctuation or reliability indices.
Conclusions:
- FASTPAC offers a considerable reduction in testing time, potentially improving patient compliance and test completion rates.
- Despite its speed advantage, FASTPAC demonstrates reduced accuracy in measuring retinal sensitivity compared to the standard program.
- The trade-off between speed and accuracy needs consideration for clinical application in glaucoma management.