Nature?s Field Eye Cap is an advance eye antioxidant and vitamins formula with zeaxanthin, lutein and bilberry to support good vision and eye health. Zeaxanthin and lutein are natural carotenoids found in the macula segment of the retina. The human body does not produce these carotenoids. Their accumulation in the eye is dependent on your dietary intake. Lutein and Zeaxanthin either help to prevent Age-related molecular degeneration (AMD) or may slow the progression of the disease. AMD occurs when the small central portion of the retina, known as the macula, deteriorates. The disease develops as the patient ages.