Bilberry extract (1987) - diabetic retinopathy

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79% of 37 patients with visible diabetic retinal abnormalities improved after taking 160 mg of bilberry extract twice daily, compared to 0% of the placebo control group, and 86% of those with abnormalities of angiography findings showed moderate to considerable improvement. Perossini, et al. Ann Ottalmol Clin Ocul 1987.

This is a small study but supports others with similar results.