Dramatic Improvement in Visual Field

I was diagnosed with Glaucoma in January of 2005. I have taken Alphagan all this time. Yesterday I saw the Dr treating me for Glaucoma. She showed me yesterday's visual field compared to one a year before. The old one was mostly black. The new one was mostly covered with numbers from 4 to 27 and a few areas of the top-31. Wow. My doctor said she thinks Alphagan has a neuroprotective effect. I know it was studied and found not to be useful for this but there must have been some reason to study it after all the time it has been around. There may be some others like me.