Clear vision is precious and requires a healthy visual system. Conditions such as dry eyes and allergies can be diagnosed and treated effectively. Regular eye examinations can detect diseases such as glaucoma and macular degeneration early on, thereby allowing treatment to prevent visual loss. There are also conditions affecting the entire body that can be diagnosed during a complete eye examination. Because ophthalmologists can actually see the blood vessels within the retina, early high blood pressure, certain types of infections, diabetes, cardiovascular and neurologic disease, to name a few, can be detected before any symptoms appear.