As your eyes gradually change, so can your vision and prescription needs. That’s why regular eye exams are so important. At your exam, Dr Smith will not only update or check for a glasses or contacts prescription, but also assess the health of your eyes. Many eye and vision problems have no obvious signs or symptoms, so you might not know that a problem exists until it is found by your eye doctor. Early diagnosis and treatment of eye and vision problems can be imperative in helping prevent future vision loss.