Electrical Stimulation for Vision Neuroenhancement in Glaucoma

Inclusion Criteria: * Participant must be at least 18. * Participant must has the ability to comply with the requirements of the study and complete the schedule of events (SOE). * Participant's clinical diagnosis must be consistent with primary open angle glaucoma (including but not limited to normal tension, low tension or general open angle) characterized by the following features: Mean deviation (MD) worse than -6 but better than -20 on reliable Humphrey Visual Field 24-2 testing * Participant's eye pressure must be clinically stable, with IOP \< 18. * If a participant has two eyes meeting study criteria, the worse eye as determined by visual field index (VFI) or patient preference, will be deemed includable. If both eyes qualify and have the same VFI, the patient may choose which eye they are willing to enter, or else a randomization procedure will assign one eye to the study. * Participant must understand and sign the informed consent. If the participant's vision is impaired to the point where he/she cannot read the informed consent document, the document will be read to the participant in its entirety. Exclusion Criteria: * Participant is unable to comply with study procedures or follow-up visits. * Participant has a history of ocular herpes zoster. * Participant has a requirement of acyclovir and/or related products during study duration. To be eligible for this study, the participant must discontinue use of these products prior to enrollment and must not continue w…