Association between vitamin D and age-related macular degeneration in the Third National Health and Nutrition Examination Survey, 1988 through 1994.
Parekh N, Chappell RJ, Millen AE, Albert DM, Mares JA.
Arch Ophthalmol. 2007 May;125(5):661-9.
PMID: 17502506
A diet deficient in omega 3 fats is known to cause impaired vision both in animals and people. That is because omega 3 fats are essential for the functioning of the nerve tissues in the brain and since the retina is an extension of the brain, it goes without saying that a deficiency of omega 3 fatty acids will have an effect in the way we see things.