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. Author manuscript; available in PMC: 2009 Aug 21.
Published in final edited form as: Am J Ophthalmol. 2008 Sep 13;147(1):39–44.e1. doi: 10.1016/j.ajo.2008.07.023

TABLE 4.

Heidelberg Retina Tomograph II and Swedish Interactive Threshold Algorithm Fast Glaucoma Progression Analysis Results in Eyes Without Disc Changes by Photography in the Glaucoma Imaging Longitudinal Study, N (% with reference to HRT II, columns)

HRT II
No Change Worsening Improvement Insufficient # of Studies (<4) Insufficient Quality (TSD ≥50) Total
GPA
No change 45 (48) 8 (57) 2 (33) 5 (26) 7 (58) 67 (46)
Possible progression 8 (9) 4 (29) 1 (17) 0 (0) 0 (0) 13 (9)
Likely progression 2 (2) 0 (0) 0 0 (0) 1 (8) 3 (2)
GPA results not available 39 (41) 2 (14) 3 (50) 14 (74) 4 (33) 62 (43)
Total 94 (100) 14 (100) 6 (100) 19 (100) 12 (100) 145 (100)

GPA = glaucoma progression analysis; HRT II = Heidelberg Retina Tomograph II; SITA = Swedish interactive threshold algorithm; TSD = topographical standard deviation.