1. Humphrey standard automated perimetry (visual field testing). This is a form of static perimetry used to assess retinal function and sensitivity. It is a commonly used photopic testing modality for the diagnosis and status of glaucoma and used frequently throughout ophthalmology and many ophthalmologic clinical studies. We hypothesize that there will be similarities in performance between Humphrey automated perimetry and OKR testing which will help validate our testing strategy. For patients with glaucoma, for whom visual field testing is frequently performed, this test will not be performed if a high-quality visual field test has been obtained within the last 6 months. For such patients, the visual field test from the clinical record will be used in the study.