Vitamin B1 (1979) & chronic open angle glaucoma
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Researchers looked at blood levels of Vitamin C and Thiamine (B1) in glaucoma patients. They found that the patients with chroonic open angle glaucoma patients had a far lower thiamine blood level than controls and related poor absorption of that thiamine. However there were not distinct differences between the controls and the vitamin C blood levels.
Asregadoo, Ann Ophthalmol 1979 Jul;11(7):1095-1100