Spinach is a leafy green vegetable that contains a substance called lutein. Lutein helps strengthen the eyes and reduces the risk of macular degeneration and cataracts, according to the North Dakota State University. Macular degeneration occurs when the center point of vision becomes compromised. Broccoli, spinach and asparagus also contain relatively high amounts of vitamin A, an antioxidant vitamin that also is beneficial for eyesight. Spinach contains more than 9,300 international units per 100-gram serving, which is well over 100 percent of the recommended daily intake. Create a vitamin A-packed side dish by sauteing broccoli, spinach, asparagus and carrots together.