He has had it in his right eye for about 5 years, the eye is starting to protrude a bit, and he has almost no vision in it. He is an artist and he needs both eyes! Are there any good solutions out there, especially natural remedies?

My father is suffering from severe vision loss resulting from having glaucoma. In my research, I’ve statements that THc can be useful in reducing eye preussure. We’ve tried all the herbal remedies we’ve come across and there has been little to no improvement. His pressure continues to waver. I want to ask the doctor about THC but I want to know of actual people it has helped. Don’t want to be let down again! Please Help!