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Mild learning effect of short-wavelength automated perimetry using SITA program
Paolo Fogagnolo1, Lucia Tanga, Luca Rossetti
1G.B. Bietti Foundation for the Study and Research in Ophthalmology, IRCCS, Rome, Italy. fogagnolopaolo@googlemail.com
Journal of Glaucoma
|October 27, 2009
Summary
The Swedish Interactive Threshold Algorithm (SITA) Short-wavelength Automated Perimetry (SWAP) shows a minor learning effect, primarily impacting the first test. This finding suggests SWAP may be suitable for early glaucoma diagnosis.
Area of Science:
- Ophthalmology
- Visual Psychophysics
- Medical Technology
Background:
- Short-wavelength Automated Perimetry (SWAP) is a visual field test.
- Ocular hypertension patients often undergo visual field testing.
- Standard automated perimetry is commonly used.
Purpose of the Study:
- To evaluate the learning effect of SITA SWAP in ocular hypertensive patients.
- To assess SWAP performance over the central 24 degrees.
- To compare SITA SWAP learning effects with previous full-threshold SWAP findings.
Main Methods:
- Twenty-seven ocular hypertensive patients participated.
- Five SITA SWAP tests were conducted per randomized eye.
- Learning effect was assessed by improvements in various perimetric indices.
Main Results:
- A significant learning effect was observed only for foveal sensitivity.
- Foveal sensitivity improved from the first to the last test.
- Other perimetric parameters showed no significant learning effect.
Conclusions:
- SITA SWAP exhibits a minimal learning effect, mainly on the initial test.
- This contrasts with the substantial learning artifacts of full-threshold SWAP.
- SITA SWAP's clinical utility for early glaucoma diagnosis warrants reconsideration.
