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In the study, the carotenoid (yellow pigment) zeaxanthin was found to improve vision in older men with macular degeneration, and the effect was comparable to that seen with the better-known carotenoid, lutein. Both zeaxanthin and lutein are widely found in colorful fruits and vegetables, especially the dark greens like spinach and kale.
The study included 60 older people with mild to moderate AMD. All but three of the participants were male and their average age was 75. They were divided into three groups: one group received 8 mg of zeaxanthin per day, another group received 8 mg of zeaxanthin plus 9 mg of lutein per day, and a third group received 9 mg of lutein per day. Visual tests were performed at the beginning of the trial and after four, eight, and twelve months of treatment.
The study’s authors reported the following findings:
The study’s authors pointed out that zeaxanthin primarily enhanced the aspects of vision that are related to the function of the cone cells of the retina, cells that naturally concentrate this pigment. Lutein is naturally concentrated in the rod cells of the retina, and the men who supplemented with lutein saw the most benefit in the aspects of vision for which the rods are responsible. They concluded that, while there was considerable overlap between the effects of lutein and zeaxanthin in men with AMD, their differences make them complementary.
“We believe that patients with AMD, particularly those short of catastrophic end stage disease, might want to enhance their declining vision with carotenoids,” they said.
You can take steps to reduce your likelihood of developing vision-dimming macular degeneration as you age:
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