Optical Coherence Tomography (OCT) Normative Data Collection Study

Inclusion Criteria: * Subject is not an employee of the eye clinic. * Age ≥18 to 90. * Able and willing to undergo the test procedures, give consent, and to follow instructions. * Healthy eye without prior intraocular surgery (except cataract surgery) and without clinically significant vitreal, retinal or choroidal diseases, clinically significant diabetic retinopathy (subject may have diabetes), or disease of the optic nerve. Small Drusen are acceptable in older subjects. * Hispanic Descent, Black or African American Descent, Asian Descent, American Indian or Alaskan Native Descent * Negative history of glaucoma. * Intraocular pressure ≤21mmHg. * Best corrected visual acuity ≥0.5. * Refraction between +6 and -6 diopters and astigmatism ≤ 2 diopters. * Normal visual field with Glaucoma Hemifield Test and Mean Deviation within normal limits, or not abnormal visual field by judgment of the ophthalmologist. * Clinically normal appearance of the optic disc, with normal appearing neuroretinal rim with respect to color and shape. The optic disc is examined ophthalmoscopically and by evaluation of stereo photographs. * When both eyes are eligible, both eyes enter the study. Exclusion Criteria: * Unreliable visual field. The reliability indices should be used as guide as well as the perimetrist's notes. * Unusable disc stereo photos. * Inability to undergo the tests. * Insufficient quality of Spectralis OCT images (this is not determined until after Spectralis OCT examination, and is an unusual circumstance). Minimum requirements are: * Retina completely included in image frame, * Quality Score ≥ 20 in the stored ART mean images, and * For ONH-R scan: Center position error ≤ 100 μm. * Note: Inability of a subject to perform one of the two scan patterns or insufficient image quality in one scan pattern does not exclude the subject or eye from the study.