To determine age-adjusted reference values of the visuALL Field Analyzer (vFA) retinal sensitivity and to assess the repeatability of the measured values and compare them with those measured by a Standard Automatic Perimetry (SAP).
Inclusion Criteria: * age 21 to 80 years * Healthy subjects with no eye diseases, normal appearing optic nerve and retina, intraocular pressure less than 19 millimeters mercury and normal standard automatic perimetry (SAP). * mild glaucoma subjects with less than -6 mean deviation * moderate glaucoma subjects with -6 to -12 mean deviation Exclusion Criteria: * spherical refraction outside ± 3.0 diopters and cylinder correction outside 2.0 diopters * Unreliable SAP (false positives, fixation losses and false negatives greater than 25% and/or observable testing artifacts) * Unreliable visuALL Field Analyzer (vFA) (greater than 25% false positive, excessive fixation losses) * SAP abnormality with pattern loss consistent with neurologic and/or other ocular diseases than glaucoma * Intraocular surgery in study eye (except non-complicated cataract or refractive surgery performed more than 6 months before enrollment and without posterior capsule opacification) * History of systemic condition known to affect visual function * History of medication known to affect visual function