Comprehensive eye exams are more than just checking for refractive errors or ocular diseases-they are also a good way to catch multiple systemic diseases. However, according to an annual survey conducted by the American Optometric Association, a quarter of Americans believe that eye exams are unnecessary if they have clear vision, with nearly half of the millennials agreeing. Unsurprisingly, a large number of asymptomatic patients who come in for comprehensive eye exams end up diagnosed with serious conditions-both ocular and systemic.