Glaucomatous, Glaucoma-Like, and Non-Glaucomatous Optic Neuropathy in High Myopia: The Two-Continent Study

Highly myopic eyes had considerable prevalences of NGON and GLON/GON, usually higher than 20% and 10%, respectively. The single IOP reading was ≤21 millimeters of mercury (mm Hg) in ≥70% of the eyes with GLON/GON. NGON (associated with large parapapillary myopic beta/gamma zone) and GLON/GON (associated with large optic disc size) differed in their relationships. Prevalences of both optic neuropathies increased in a nonlinear manner with longer axial length, reaching values of 50% to 100% in extreme high myopia.