Wong A, et al. - In this study, researchers compare optic disc topography in eyes in three intraocular pressure (IOP) groups of < 15 mmHg, 15-20 mmHg, and ≥ 21 mmHg utilizing spectral domain optical coherence tomography (SD-OCT) and confocal scanning laser ophthalmoscopy, adjusting for the degree of damage, as measured by retinal nerve fiber layer (RNFL) thickness and average visual field loss. The outcome suggests that the normal-tension and high-tension glaucoma are not distinguishable by optic nerve head topography with HRT and OCT when the degree of damage by Humphrey visual field testing is considered.