Kim JS, et al. - Researchers performed this retrospective observational cohort study to examine clinical characteristics and risk factors for glaucoma conversion of the contralateral eye in unilateral normal-tension glaucoma (NTG) patients. The sample consisted of 76 individuals who had been diagnosed with unilateral NTG at the baseline and followed up for more than 5 years. Twenty-one of 76 (27.6%) individuals were confirmed to have developed glaucoma in the non-glaucomatous contralateral eye during the mean follow-up period of 7.3 ± 2.4 years. Patients with unilateral NTG who have a low central corneal thickness and a high maximum width of β-zone parapapillary atrophy-disc diameter ratio, as well as high intraocular pressure in the contralateral eye, are more likely to develop glaucoma in that eye over time.