The vitamin that is essential to our eye health

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The sunrise and sunset may be free, but their benefits toward eye care are priceless—if captured.

Vitamin D, a compound unlocked by the power of sunshine and essential for the absorption of calcium into the bones, also possesses a scope of healthful benefits for the eyes. From reduced risk of macular degeneration (which causes fuzziness) to improved tear function, vitamin D has been proven to affect our eyesight in many ways—some of which may be a surprise.

Vitamin D deficiency is an increasing global problem. Research links low levels of vitamin D to:
1. Age-related macular degeneration (AMD): Anyone who has experienced a noticeable change in his or her ability to thread a needle or read a road sign has likely experienced signs of macular degeneration, a disease that affects the part of the eye that enables us to see small details.1
2. Increased risk of diabetic retinopathy: One of the leading causes of blindness among adults, diabetic retinopathy—which involves the retina and blood vessels of the eye—is a common complication of diabetes.2 While the cause is still unclear, vitamin D may play a role based on how its affects various eye conditions, including inflammation, glucose tolerance and blood pressure.2
3. Dry eye syndrome and impaired tear function: Because research indicates vitamin D possesses anti-inflammatory properties, it could prevent dry eyes. Researchers also suggest vitamin D may help prevent dry eyes by producing a protein called cathelicid, which can help to heal eye wounds.3

Each of us has likely experienced our eyes being bigger than our stomachs, but our eyes can still benefit equally from what our stomachs take in. In addition to sunshine and supplements, many foods serve as good sources of vitamin D. Among them:2

• Fish: Cod liver oil, swordfish, salmon, tuna, sardines, mackerel and herring
• Nuts and seeds: Almonds, Brazil nuts, pumpkin seeds and sesame seeds
• Fruits and vegetables: Avocado, dark leafy vegetables such as spinach and collard greens, mushrooms
• Dairy: Swiss cheese, fortified milk and yogurt
• Other: Eggs and liver

Ideally, you could eat these foods in the sunshine, which like our eyesight, is priceless. With a good diet, you can help manage it to the letter.

1.“Vitamin D deficiency 2.0: an update on the current status worldwide,” European Journal of Clinical Nutrition, January 20, 2020,
2.“Vitamin D Deficiency,” Medline Plus, September 23, 2021,,to%20become%20soft%20and%20bend.
3. “Why Your Eyes Need Vitamin D and Where to Get it,” Rebuild Your Vision, March 1, 2021,