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Optic disc size and progression of visual field damage in patients with normal-tension glaucoma

Authors Hayamizu F, Yamazaki Y, Nakagami T, Mizuki K

Received 7 January 2013

Accepted for publication 28 February 2013

Published 3 May 2013 Volume 2013:7 Pages 807—813

DOI https://doi.org/10.2147/OPTH.S42468

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Fukuko Hayamizu, Yoshio Yamazaki, Takako Nakagami, Kenji Mizuki

Department of Ophthalmology, Division of Visual Science, Nihon University School of Medicine, Tokyo, Japan

Purpose: Our goal was to evaluate the influence of optic disc size on the progression of visual field damage in patients with normal-tension glaucoma (NTG).
Subjects and methods: Eighty-two eyes of 82 NTG patients who had been receiving topical antiglaucoma medications and followed-up for more than 4 years were enrolled in this study. The patients were allocated to two groups, according to the mean size of their optic discs. The data were analyzed using regression analysis, based on the Cox proportional hazard model.
Results: The probability of visual field stability was significantly lower in eyes with large discs than in those with small discs (log rank test, P = 0.007). Progression of visual field damage was significantly associated with the optic disc area (hazard ratio [HR]: 1.812, P = 0.018), occurrence of disc hemorrhage (HR: 2.116, P = 0.028), and intraocular pressure reduction ratio (HR: 0.957, P = 0.014).
Conclusion: The optic disc area correlates with progression of visual field damage in patients with NTG.

Keywords: Cox proportional hazards model, disc hemorrhage, disc size, intraocular pressure, Kaplan–Meier life-table analysis

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