Spinach
Spinach is one of the best dietary sources of lutein and zeaxanthin, two pigments found naturally in the retina. It is grown across South Africa and is available year-round, with baby spinach sold in clamshell packaging in most supermarkets and large-leaf spinach sold in bunches at markets.
Spinach wilts down significantly when cooked, so a large bag yields a surprisingly small portion. Sauté it with garlic and olive oil, or add it raw to smoothies if you prefer.