Patient Screening - Prior to any study-related procedure, delegated study team members will approach potentially eligible adult subjects diagnosed with early visual field defects open angle glaucoma or ocular hypertension. Those who may be eligible will be offered the choice of undergoing screening to be enrolled in the study or receiving standard public treatment for their current illness without participating in the study. Subjects who do not meet inclusion criteria or who are for any other reason determined to be too ill for inclusion in the study, or who decline to participate in the study, will be considered and recorded as "screen failure" and receive standard and appropriate treatment.