Take proper care of your contact lenses. Anytime you put in or take out your contact lenses, make sure that you have thoroughly washed your hands. Also, replace your lenses as instructed and disinfect them like you should. If not properly taken care of, contact lenses can cause you a lot of grief.
Try to always wear sunglasses if you are going to be out in the sun. Having your eyes exposed to too much ultraviolet makes you more susceptible to getting macular degeneration and cataracts. Make sure you choose sunglasses that block from 99% to 100% of the UVB and UVA rays.
Know your history. If your parents or grandparents had trouble with their eyes, chances are you will too. Make an effort to get checkups at the eye doctor more often, to ensure that no problems have developed. And, if you are diagnosed with anything, make sure your family members know about it.