First, have a balanced diet like eating foods rich in Vitamins C, A, E, beta carotene and zinc, which can help keep eyes healthy. Getting enough sleep is a good way to keep eyes away from dryness, redness and irritation so that your eyes can keep clear and white. Next, give your eyes enough time to rest while reading, watching TV or playing computer in case your eyes get tired and stressed. You'd better take regular breaks when you stare at the screen so as to relax your eyes, which is also a good way to keep eyes clear and white.