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Heidelberg retina tomograph (HRT)

Variability of vertical cup to disc ratio measurement and the effects of glaucoma 5-year risk estimation in untreated ocular hypertensive eyes
Poemen P Chan, Vivian Chiu, Mandy O Wong

British Journal of Ophthalmology Mar 2019, 103 (3) 361-368; DOI: 10.1136/bjophthalmol-2017-311841