ABSTRACT.Purpose: To evaluate the visual field rate of progression of patients with treated ocular hypertension (OHT) and primary open-angle glaucoma (POAG) in clinical practice, using the mean deviation (MD) and the visual field index (VFI). Methods: Non-interventional cohort study. From a large multicentre database representative of the French population, 441 eyes of 228 patients with treated OHT or POAG followed up at least 6 years with Humphrey 24.2 Sita-Standard visual field examination at least twice a year were identified. From initial data, eyes were classified in five groups: 121 with OHT, 188 with early glaucoma (MD greater than À6 dB), 45 with moderate glaucoma (MD À6 to À12 dB), 41 with advanced glaucoma (MD À12 to À18 dB) and 46 with severe glaucoma (MD less than À18 dB). Rate of progression during the follow-up period was calculated using the trend analysis of the Guided Progression Analysis software. Results: The mean duration of follow-up was 8.4 AE 2.7 years and the mean number of visual field, 18.4 AE 3.5. In eyes with OHT, rate of progression was À0.09 dB/year (À0.17%VFI/year). In eyes with POAG, rate of progression was À0.32 dB/year (À0.83%VFI/year) in eyes with early glaucoma, À0.52 dB/ year (À1.81%VFI/year) in moderate glaucoma, À0.54 dB/year (À2.35%VFI/ year) in advanced glaucoma and À0.45 dB/year (À1.97%VFI/year) in severe glaucoma. In eyes with POAG, a significant progression (p < 0.05) was detected in 159 of 320 eyes (49.7%) with trend analysis and 117 of 320 eyes (36.6%, likely progression) or 183 of 320 eyes (57.2%, possible and likely progression) with event analysis.Conclusions: Primary open-angle glaucoma is a progressive disease in the majority of patients despite cautioned treatment and follow-up. The rate of progression varies greatly among subjects.