There are many ways that I can take care of my eyes.
Avoid wearing contact lenses for more than 19 hours. This can cause permanent sight damage as well as extreme discomfort to your eyes. Don't wear glasses too long either. Especially 3-D glasses!
Use cucumber on your eyelids. Press cold cucumber slices gently against eyelids 10 minutes before going to sleep at night to prevent puffiness.
Wear UV protective sunglasses. Get polarized lenses, NOT just darker lenses. The lenses that only make the world darker will just make your pupils dilate and don't do a thing to stop the UV rays.