Two carotenoids, one vital piece of anatomy. Lutein and zeaxanthin are the pigments that give the macula its yellowish tint, and they play a central role in protecting your central vision. Understanding them helps explain why the AREDS 2 formula is built around them.

What Are Carotenoids?

Carotenoids are the yellow, orange, and red pigments found in plants — the compounds that make carrots orange and kale deep green. Over 600 carotenoids exist in nature, but only a small number accumulate in the human body in meaningful quantities. Of those, only lutein and zeaxanthin concentrate significantly in the retina.

Importantly, your body cannot make lutein or zeaxanthin. They must come entirely from diet or supplements.

Where Do They Concentrate in the Eye?

The macula contains an unusually high concentration of these two carotenoids, forming what’s called the macular pigment. This pigment is what gives the macula its yellowish colour — it’s sometimes referred to in anatomy as the “macula lutea” (Latin for yellow spot).

Their distribution within the macula is precise: zeaxanthin concentrates most densely at the very centre (the fovea, where your sharpest vision comes from). Lutein is more abundant in the surrounding ring. A third form, meso-zeaxanthin, is generated in the retina itself by converting lutein.

The Macular Pigment: Your Eye’s Built-in Filter

Macular pigment serves two protective functions that matter directly for AMD risk:

• Blue-light filtration: it absorbs high-energy visible blue light before it reaches the photoreceptors beneath. Blue light is one of the main drivers of oxidative stress in the macula.
• Antioxidant activity: lutein and zeaxanthin neutralise free radicals generated by light exposure, reducing cumulative oxidative damage to the retinal cells.

Higher macular pigment optical density (MPOD) is associated with better contrast sensitivity and reduced glare. Conversely, low MPOD is associated with greater vulnerability to AMD.

MPOD naturally declines with age. Smoking, high UV exposure, and a diet low in these carotenoids all accelerate the decline.

How Much Do We Get From Food?

The richest dietary sources of lutein are leafy green vegetables — kale, spinach, Swiss chard. Egg yolks are an excellent source of both lutein and zeaxanthin in a highly bioavailable form. Corn and orange peppers provide zeaxanthin specifically.

The problem: the average UK diet provides roughly 1-2mg of lutein per day, and very little zeaxanthin at all.

The AREDS 2 trial used 10mg lutein and 2mg zeaxanthin daily — approximately five to ten times more than most people eat. To reach 10mg of lutein from food alone, you’d need to eat two large portions of kale every single day, consistently. For most people, that’s not realistic.

What the Research Shows

In the 2013 AREDS 2 trial, the lutein/zeaxanthin-containing formula was associated with approximately 25% lower risk of progression to advanced AMD over five years in people with intermediate AMD or advanced AMD in one eye.

A secondary analysis also found that participants receiving lutein and zeaxanthin (rather than beta-carotene from the original AREDS formula) had better outcomes — particularly among former smokers. This was one reason the updated formula was considered an improvement, not just a safety-driven change.

It’s worth noting that AREDS 2 is a multi-nutrient formula. The specific contribution of lutein and zeaxanthin in isolation is hard to separate from the broader formula effect. What we can say is that the logic is sound: replacing the original formula’s beta-carotene with the carotenoids the macula actually contains is a more targeted nutritional choice.

What PreserVision AREDS 2 Contains

Per daily dose (2 soft gels): Lutein 10mg + Zeaxanthin 2mg — alongside Vitamin C 500mg, Vitamin E 400 IU, Zinc 80mg, and Copper 2mg. This matches the exact amounts used in the AREDS 2 clinical trial.

More about the full AREDS 2 formula and who it’s suitable for.