In the study, greater intake of dietary nitrate and green leafy vegetables was associated with a 20 to 30 percent lower risk of primary open-angle glaucoma (POAG), researchers said.
    
Elevated intraocular pressure and impaired autoregulation of optic nerve blood flow are implicated in POAG - optic nerve damage from multiple possible causes that is chronic and progresses over time.
    
This manifests as a gradual loss of the visual field, starting with a loss of peripheral vision, but eventually the entire vision may be lost if not treated.

Eligible participants were 40 years or older, were free of POAG, and reported eye examinations. Information on diet was updated with questionnaires.
    
The researchers found that greater intake of dietary nitrate and green leafy vegetables was associated with a 20 percent to 30 percent lower POAG risk.
    
The findings were published in JAMA Ophthalmology.

 

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