open-angle glaucoma low tension glaucoma MESH:D057066 SNOMEDCT_US_2020_03_01:155124000 disease_ontology ICD10CM:H40.12 UMLS_CUI:C0152136 An open-angle glaucoma characterized by increased intrinsic resistance to aqueous outflow without known secondary causes, an anatomically narrow anterior chamber angle, or elevated intraocular pressure compared to the average population. Normal tension glaucoma has_symptom progressive decreased vision and progressive loss of peripheral vision. ICD9CM:365.12 DOID:13544 Normal tension glaucoma