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DL Budenz, P Rhee, WJ Feuer, J McSoley, CA Johnson, DR Anderson; Comparison of Glaucomatous Visual Field Defects Using the Full Threshold and the Swedish Interactive Threshold Algorithms . Invest. Ophthalmol. Vis. Sci. 2002;43(13):3903.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose:To compare the severity, size, and depth of glaucomatous visual field defects using standard Full Threshold (FT), SITA Standard (SS), and SITA Fast (SF) algorithms of the Humphrey perimeter. Methods:A prospective observational case series of 77 glaucoma patients who performed FT, SS, and SF 30-2 white-on-white testing programs on the same day on 2 separate occasions during a 1 month period was performed. The severity of defects was compared using the mean deviation, pattern standard deviation, AGIS (Advanced Glaucoma Intervention Study), and Hodapp-Anderson-Parrish severity scores. The sizes of defects were compared using the total number of abnormal points on the Pattern Deviation Plot that fit standard criteria for glaucomatous visual field defects. The depths of the defects were compared using the sum of the threshold values for points identified in the Pattern Deviation Plot as fitting criteria for glaucomatous defects. Results:The mean deviations were slightly better using the SS (-9.6+/-7.1 dB, mean+/-standard deviation) or the SF (-9.1+/-6.7 dB) algorithms compared to the FT algorithm (-10.3+/-7.1 dB, p<0.001). There were no significant differences in pattern deviations between SS (8.6+/-4.0, p = 0.075) or SF (8.1+/-3.6, p = 0.19) compared to FT (8.3+/-3.3) although the pattern standard deviation was higher in SS fields compared to SF (p < 0.001). AGIS scores were slightly better when the SS (7.5+/-5.6) or SF (7.3+/-5.3) algorithms were used compared to the FT algorithm (8.6+/-5.4, p<0.001). The sizes of glaucomatous defects were slightly larger using the SS (20.9+/-10.7) algorithm than the FT (19.2+/-10.9, p=0.008) but not the SF algorithm (20.0+/-10.6, p = 0.11). The depth of defects measured by the SS (220.4+/-108.0 dB) and SF (219.8+/-101.3 dB) algorithms were significantly shallower compared to the FT algorithm (152.3+/-79.1 dB, p<0.001). There were no significant differences in HAP severity scores between algorithms (p = 0.12). Conclusion:Glaucomatous defects are shallower using the new SITA algorithms but are approximately the same size and severity.
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