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New perimetric threshold test algorithm with dynamic strategy and tendency oriented perimetry (TOP) in glaucomatous
1Department of Ophthalmology, Kobe University School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe-shi, Hyogo 650, Japan. hidetaka@med.kobe-u.ac.jp
Eye (London, England)
|December 16, 2000
Summary
Dynamic strategy (DS) and tendency oriented perimetry (TOP) offer faster visual field testing than normal strategy (NS) for glaucoma detection. DS is more efficient for early glaucoma, while TOP is suitable for advanced cases or time-constrained patients.
Area of Science:
- Ophthalmology
- Visual field testing
- Glaucoma diagnosis
Background:
- Computerized static threshold perimetry is crucial for glaucoma assessment.
- New algorithms aim to improve the efficiency and reliability of visual field testing.
Purpose of the Study:
- To compare the time-wise reliability and efficiency of dynamic strategy (DS) and tendency oriented perimetry (TOP) against the standard normal strategy (NS).
- To evaluate the performance of these strategies in detecting early glaucomatous visual field defects.
Main Methods:
- 41 normal eyes and 36 glaucomatous eyes were tested using NS (4-to-2 dB), DS, and TOP on an Octopus 1-2-3 perimeter.
- Test time, stimulus time, mean sensitivity (MS), and loss variance (LV) were analyzed using Program 32X grid pattern.
Main Results:
- DS and TOP significantly reduced mean test time compared to NS (52% and 78% reduction, respectively).
- MS did not differ across strategies. LV was lower with TOP in glaucoma patients, suggesting underestimation of local defects.
- DS and TOP showed inferior ability to detect early glaucoma compared to NS.
Conclusions:
- DS demonstrated greater efficiency in detecting early glaucomatous defects than TOP.
- TOP offered reduced testing time and may be suitable for patients with limited time or advanced visual field defects.