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Abstract #26137 Published in IGR 12-2
Mild Learning Effect of Short-wavelength Automated Perimetry Using SITA Program
Fogagnolo P; Tanga L; Rossetti L; Oddone F; Manni G; Orzalesi N; Centofanti MJournal of Glaucoma 2010; 19: 319-323
PURPOSE: To evaluate the learning effect at Short-wavelength Automated Perimetry (SWAP) using the Swedish Interactive Threshold Algorithm (SITA) program over the central 24 degrees on patients with ocular hypertension experienced with standard automated perimetry. METHODS: Twenty-seven patients underwent 5 SITA SWAP tests at intervals of 5+/-2 days in a randomized eye. Learning effect was defined as an improvement in results for duration, perimetric indices, foveal sensitivity, Glaucoma Hemifield Test, number of points with a P<5% and <1% in the total, and pattern deviation maps, total, central, paracentral, peripheral, and quadrant sensitivity. RESULTS: Learning effect was shown for foveal sensitivity (P=0.006, analysis of variance), which was significantly different only between the first (23.0 dB+/-4.1 dB) and the last test (24.7 dB+/-3.8 dB, P=0.003, t test) and was not affected by any demographic or ophthalmic characteristics of the population. All the other parameters did not show any significant learning effect. CONCLUSIONS: SITA SWAP is affected by a small learning effect interfering only with the first test, as opposite to full-threshold SWAP program, which previously showed severe learning artefacts. This fact may induce reconsideration of the clinical utilization of SWAP for the early diagnosis of glaucoma.
G.B. Bietti Foundation for the Study and Research in Ophthalmology, IRCCS, Rome Italy.
Classification:
6.6.3 Special methods (e.g. color, contrast, SWAP etc.) (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)