Advanced Imaging for Glaucoma Study

Inclusion Criteria for Normal Participants: * No history of glaucoma, retinal pathology, keratorefractive surgery, or corticosteroid use. * Normal visual field (VF), intraocular pressure (IOP), optic nerve head and nerve fiber layer. * Central pachymetry \> 500 μm. * Open angle. Inclusion Criteria for Glaucoma Suspects \& Pre-Perimetric Glaucoma Participants: * Ocular hypertension, defined as IOP ≥ 24 mmHg in one eye and IOP ≥ 22 mmHg in the fellow eye, on or off glaucoma medications. * Optic nerve head (ONH) or nerve fiber layer (NFL) defect visible on slit-lamp biomicroscopy and stereo color fundus photography as defined for the PG group. * The fellow eye meeting the eligibility criteria for the PG group. * GSPPG eyes must not have an abnormal VF as defined for the PG group. * GSPPG participants having glaucomatous ONH or NFL defect are subclassified as PPG; the remainder are subclassified as GS. Inclusion Criteria for Perimetric Glaucoma Participants: * Abnormal VF and * Glaucomatous ONH of NFL defect. Exclusion Criteria Common to All Groups: * Best corrected visual acuity worse than 20/40. * Age \< 40 or \> 79 years. * Refractive error \> +3.0D or \< -7.0 D. * Previous intraocular surgery except for uncomplicated cataract extraction with posterior chamber IOL implantation. * Diabetic retinopathy or other disease that may cause visual field loss or optic disc abnormalities. * Inability to clinically view or photograph the optic discs due to media opacity or poorly d…