If you get the red eyes, your eyes may get infection. Your eye may be irritated by some stimulates. In order to reduce your redness, you'd better take vitamin C instead of the vitamin a to help you because the vitamin C will moisture the eyes. There are a lot of foods with vitamin C that you could take them into reference. There are a lot of fruits rich in vitamin C, like kiwi, hawthorn, grapefruit, strawberries, oranges, lemons and so on. You could take any of them every day to keep the eyes get moisture. You could take some fresh vegetables, such as spinach, vegetable, leek, green peppers, cucumber, pakchoi, broccoli and cauliflower with fresh jujubes. The food containing with vitamin C can enhance immunity. In addition, it can reduce your heart disease and stroke and prevent cold. About the vitamin A, it is also an important element for the eyes vision, especially for the night vision. If you want to improve the night vision, you could take more vitamin A.