A comprehensive eye exam is a full evaluation of your vision and eye health. Periodic examinations are important for early diagnosis and treatment of eye and vision problems. Eye exams are important for maintaining good vision and eye health, and when possible, preventing vision loss. Most individuals are often unaware that problems exist because many eye and vision problems have no obvious signs or symptoms. A comprehensive adult eye and vision examination may include patient history, visual acuity, preliminary tests, keratometry, refraction, eye focusing and movement tests, eye health evaluation, and supplemental testing.