Eat leafy greens to see clearly.

"Lutein and zeaxanthin, which are found in leafy greens like kale, travel to the central area of the retina (called the macula), and are the only known carotenoids located in the human visual system. Previous research has shown that these pigments are protective against age-related macular degeneration. Scientists now have evidence that these macular pigments also play important roles in visual performance.

Since our bodies can’t produce these pigments, levels of lutein and zeaxanthin in the retina depend on the amounts consumed in the diet. "

http://www.diseaseproof.com/archives/cat-eye-health.html