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    The NADefense Blog

    Learn More About Vision Wellness

    Plain-English guides on eye health, the science behind our ingredients, and how to have better conversations with your ophthalmologist.

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    A 400-Year-Old Shark May Be Teaching Us Something About Eye Aging Eye Health
    April 17, 2026

    A 400-Year-Old Shark May Be Teaching Us Something About Eye Aging

    Greenland sharks can live more than 400 years. A new study looked at how their retinas stay functional that long. The findings point back to pathways we already...

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    Ophthalmologist-founded supplements designed to support long-term vision wellness through targeted cellular nutrition.

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    * These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Sight Guard is a dietary supplement. Consult your physician before starting any supplement regimen.

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