Additional Study Information: Glaucoma is the leading cause of irreversible blindness worldwide. The most important test to detect progression is visual field testing. However, this test is very subjective, often unreliable, and variable. One of the main causes of unreliable tests is the lack of attentiveness or concentration during the test. Previous studies have shown that listening to Mozart or taking vitamin B12 can improve the reliability of this test. Recent studies have suggested that over-the-counter medications such as Nicotinamide (Vitamin B3) and Calcium pyruvate can also improve the performance during this test. This can ultimately reduce costs due to repeated testing and increase doctor's certainty when analyzing the results of this test. We want to test whether these over-the-counter nutritional supplements can improve patients' performance during visual field testing and thus make the test results more reliable. Compensation of $200 is provided at the end of the 7 visits. Not accepting healthy volunteers.