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Increase Circulation
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The main cause of normotensive open glaucoma is often overlooked by eye doctors. Reduced blood flow to the eyes and therefore oxygenation of the eyes is the main cause. Google eyes moxibustion (moxa).
Invest in legs sleeves that pump blood from your lower body up.
I think everyone over 60 should have it. Increased blood flow to oxygen starved tissues and organs including brain and eyes do wonders in the long time.
Read Dr. Jack Kruse blogs about glaucoma (Optimal health). Sun gazing the very first few minutes after sun rises above horizon is a must according to him.