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While the condition known as dry eye may sound like a minor problem, it can cause tremendous discomfort, even pain. Worse, this disorder can lead to eye fatigue, blurred vision, and difficulty driving, especially at night. In a healthy eye, lubricating tears continuously bathe the cornea -- the dome-shaped outer surface of the eye. These tears provide a layer of liquid protection from the environment while nourishing the cells, keeping the eyes comfortable, and helping the eyes function properly. But when tears are not of adequate quality or quantity, dry eye disease occurs.Written by optometrist Jeffrey Anshel, What You Must Know About Dry Eye is divided into two parts. Part One begins by explaining the anatomy of the eye and how it works. It then focuses on dry eye -- what the condition is, what causes it, how it impacts vision, and how it is diagnosed.