Researchers from the University of Buffalo did a study on 913 women age 54-74 on the effects of vitamin D and macular degeneration (Carotenoids in Age-Related Eye Disease Study). More than half of the group had adequate levels of Vitamin D but the others had inadequate.
The new data published in JAMA Opthalmology suggested that sufficient levels of vitamin D may help reduce the risk of developing age-related macular degeneration (AMD) in women who are at high genetic risk for the disease. It showed that those in the deficiency group had a 6.7-fold increased chance of developing AMD and two genetic risk markers for the disease. They also explained that dosages of more than 12 ng/ml (1200 iu) didn’t further lower the risk.