Marketing messages teach us to look for solutions in the form of a pill or an easy fix. Glaucoma taught me that this brand of alternative medicine is fundamentally equal to allopathic medicine. In fact, the business model is identical and many of the same pharmaceutical companies are behind the "natural" supplements and the allopathic drugs. (The mindset is also nearly identical -- it is the mindset of looking for a solution without fundamentally changing ourselves.)
I carefully tested high levels of vitamin C over a number of years. Vitamin C was actually the first thing I focused on after being diagnosed with glaucoma. I used it before beginning self-tonometry and I continued for several years after starting self-tonometry.
In those first two years (before self-tonometry) the vitamin C did not prevent my glaucoma from progressing. And I found out after I got a tonometer that it did not reduce my IOP. I used 30 grams per day while testing its effect on my IOP. My IOP is lower today on zero vitamin C (as a result of the knowledge I gained from self-tonometry).
The reason it is important to focus on IOP is because it is the only treatable risk factor for glaucoma. And it is very important to have metrics. No matter what we are doing (vitamins, diet, etc.), we need to have some way to measure the results.
And the wisely empirical approach advocated by FitEyes does often involve testing one element at a time. That's the way we make discoveries and progress past ignorance. Unlike almost any other patient support group in the world, FitEyes has a track record of discovering new knowledge. (We discovered and documented white coat ocular hypertension, for example.) That's why this is a research community at its core.