While the ancients extolled the eyes as “windows to the soul,” today’s physicians value the eyes for their ability to provide a non-invasive look inside the body. The fact is that the eye is the only place in the body where a doctor can see nerves, arteries, and veins without using a scalpel. When the eye doctor peers into the eyes to look for signs of eye disease, he or she may also be able to see disease processes that are occurring elsewhere in the body. For instance, the ophthalmologist may see narrow or enlarged blood vessels and hemorrhages, which can be indicators for hypertension. In addition, cholesterol buildup may be observed, prompting an appointment with the cardiologist.
P.S. Because elevated blood sugar can lead to swelling in the eye lens, vision problems may be indicative of diabetes.