Are There Changes in the Nerve Fiber Layer (NFL) After Lowering of Eye Pressure?

Inclusion Criteria: * All patients with glaucoma (primary open-angle glaucoma, angle recession glaucoma, exfoliation syndrome glaucoma, pigmentary glaucoma and chronic angle closure glaucoma) in whom a pressure-lowering intervention was conducted Exclusion Criteria: * Inability to obtain reliable field or optical coherence tomography pre-intervention * Visual acuity less than 20/40, * Age \<18 or \>90 years, * Other cause for visual field loss not glaucoma, that is, visual field loss due to cataract optic neuropathies, retinal disease * Spherical equivalent refractive error \> +5.00 Diopters and \> 3.00 Diopters cylinder * Concomitant cataract and glaucoma surgery