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D. W. Switzer, S.-Y. Wu, M. C. Leske, A. Hennis, B. Nemesure, N. Mehta, R. A. Honkanen, L. Hyman; Comparing the Advanced Glaucoma Intervention Study (AGIS) and Brussini’s Glaucoma Severity Scale (GSS-Br) Scoring Systems Using Theoretical Threshold Data. Invest. Ophthalmol. Vis. Sci. 2009;50(13):5288.
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© ARVO (1962-2015); The Authors (2016-present)
To compare visual field (VF) scores, as calculated with the AGIS and GSS-Br methods, for global depression (GD), superior arcuate (SA), paracentral (PC), and superior nasal step (SNS) defects of varying depths.
A program was written in Filemaker Pro 8 to calculate AGIS and GSS-Br scores and generate VF parameters from theoretical threshold data, as described in another abstract. Baseline thresholds were set to the calculated normative threshold values for a 50 year old. The Humphrey VF (HVF) 24-2 pattern was used. GD was defined as a depression in all 54 VF test locations. SA defect was defined as a depression in test locations 15, 20, 21, 23,24,1,7,10, and 11. SNS defect was defined as depression in test locations 6, 5, 4, 9 and 8. Paracentral defect (PC) defect was defined as depression in test locations 2, 16, 29, and 42. (All described for 24-2 pattern HVF). Simulated GD, SA, SNS, and PC defects were increased in 2 dB increments up to 30 dB. AGIS and GSS-Br scores were calculated and compared for each.
Both AGIS and GSS-Br systems showed relatively good correlation with scores with scores that increased with the severity of the field defect as shown in the table below. AGIS and GSS-Br scores reached their maximal levels with 28 and 22 dB of GD, respectively, with similar results for SA defect.
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