Schedule an exam in the future. A lot of people simply aren't visiting their eye doctor as regularly as they should. You should have your vision checked at least once in your twenties and then twice in your thirties, but that's only if you don't have history or symptoms of vision problems.
Get more Omega-3. Omega-3 fatty acids have plenty of health benefits and yet another has been discovered that helps the eyes. As most people grow older, their eyes stop producing enough oil and mucus to lubricate the eyes. However, diets with plenty of Omega-3 have been shown to increase the production of the required oils within the eye.