Details: Routine eye exams are important, regardless of your age or your physical health. During a comprehensive eye exam, doctors do much more than just determine the prescription of your eyeglasses or contact lenses. They will also check your eyes for common eye diseases, assess how your eyes work together as a team, and evaluate your eyes as an indicator of your overall health. Eye exams are an important part of your health. Adults should have their eyes tested a couple times per year to keep their prescriptions current and to check for early signs of eye diseases.