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Normal\u2010tension glaucoma (NTG) patients with IOP consistently \u226415\u00a0mmHg without treatment were enrolled. The presence or absence of DH was checked semi\u2010annually on the fundus photographs by three independent observers, while patients were followed without treatment. Cox proportional hazards model taking inter\u2010eye correlation into consideration was adopted to identify risk factors for DH occurrence. The main outcomes were DH occurrence probability during 5\u2010year period and its risk factors.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>One hundred seventeen eyes of 90 patients with mean age of 54.1\u00a0years, mean deviation value of \u22123.6 decibels and mean IOP during follow\u2010up of 12.4\u00a0mmHg were included. Disc haemorrhage (DH) was observed at least once in 34 eyes and more than twice in 15 eyes during the follow\u2010up. The DH occurrence probability at 5\u00a0years was 31% (95% confidence interval: 21\u201340%), and lower myopic refraction (HR\u00a0=\u00a01.18; p\u00a0=\u00a00.018), higher IOP during follow\u2010up (HR\u00a0=\u00a01.35; p\u00a0=\u00a00.047) and presence of DH at baseline (HR\u00a0=\u00a04.19; p\u00a0=\u00a00.002) were its risk factors.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Disc haemorrhage (DH) occurrence probability of Japanese healthy NTG patients with mean IOP of 12.4\u00a0mmHg and no systemic and\/or topical treatment was 31% at 5\u00a0years. Lower myopic refraction, higher IOP and its existence at baseline were its risk factors.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aos.14506","type":"journal-article","created":{"date-parts":[[2020,6,13]],"date-time":"2020-06-13T07:25:00Z","timestamp":1592033100000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["The occurrence of optic disc haemorrhage in primary open\u2010angle glaucoma eyes with lower normal pressure and its relating factors"],"prefix":"10.1111","volume":"99","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1411-1476","authenticated-orcid":false,"given":"Rei","family":"Sakata","sequence":"first","affiliation":[{"name":"Department of Ophthalmology Graduate of Medicine and Faculty of Medicine The University of Tokyo Tokyo 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