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Antioxidants
Turmeric offers effective neurprotection - may be important in glaucoma to prevent optic nerve damage
Oxidative stress has been implicated in the degeneration of retinal ganglion cells in the optic nerve in glaucoma. Antioxidants protect against oxidative stress and are therefore considered important in neuroprotection strategies. Turmeric has been shown to be an effective antioxidant. For background info about oxidative stress and glaucoma, see this article: Glaucoma, Inflammation and Oxidative Stress: An Attempt to Unify Recent News
Turmeric root is good for the retina
I eat the spice turmeric almost every day. My favorite way to consume it is to use the fresh root in my cooking. If I do not have fresh turmeric root available, I'll use organic turmeric root powder and mix it in with my food (or even sprinkle a little on top if I'm not cooking). 
More on oxidative stress in neurodegenerative diseases
Glaucoma is a neurodegenerative disease of the optic nerve. Neuroprotection should be of great interest to any glaucoma patient. The abstracts below deal with potential use of dietary antioxidants in the prevention and treatment of neurodegenerative disorders.
Calabrese V, Cornelius C, Mancuso C, et al:
Cellular Stress Response: A Novel Target for Chemoprevention and Nutritional Neuroprotection in Aging, Neurodegenerative Disorders and Longevity.
Neurochem Res 2008
