Study 1 involves the optimization of the device parameters. Study 1 will test adult subjects with no history of ocular disease (Study 1A) to assess the limits of human contrast sensitivity and subjects with definite glaucoma (Study 1B) by gathering preliminary data for comparison. These two pilot sub-studies intend to provide rapid data in regard to the device testing results to support the study hypothesis. This strategy will help rule out false negatives and false positives so that any adjustments can be made prior to the start of Study 2 for longitudinal data collection. Study 2 involves determination of baseline population parameters for an older population more likely to be age-matched with patients with glaucoma, as well as performance of patients with various levels of glaucoma severity.