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B.M. Bengtsson, A. Heijl; SITA SWAP, a New Rapid Threshold Testing Strategy for Blue-On-Yellow Perimetry . Invest. Ophthalmol. Vis. Sci. 2003;44(13):52.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To study the performance of the new SITA SWAP program Methods: The SITA threshold algorithms were modified and optimized for SWAP testing. We compared threshold reproducibility, test time, and mean sensitivity of SITA SWAP and the older Full Threshold SWAP in 10 normal subjects and 31 glaucoma patients. Data from 53 normal subjects was used to calculate preliminary age-corrected normal threshold limits. Results: Average testing time was 3.6 min for SITA SWAP and 11.8 min for Full Threshold; ( p<0.0001). Mean threshold reproducibility, calculated as absolute difference between two tests, did not differ significantly between the two programs and was 2.4 dB for SITA, 2.3 dB for Full Threshold. SITA SWAP showed higher threshold sensitivity, 21.6 dB on average, than Full Threshold SWAP with a mean of 17.3 dB. Average inter-subject variability (standard deviation) was 15% smaller with SITA SWAP than with Full Threshold SWAP, and the Total Deviation normal limits at the p<5% significance level were on the average 14% narrower with SITA SWAP. Conclusion: SITA SWAP gave shorter test time, increased dynamic range, narrower normal limits and unchanged reproducibility as compared to Full Threshold SWAP. SITA SWAP may become a clinical useful method for early detection of glaucomatous visual field loss.
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