Tears are essential for the health of the eyes. They keep the ocular surface lubricated and smooth and help them focus light for clear vision. They are also helpful in keeping the eyes clean of debris and dirt. Every time you blink, the eyelid helps spread a thin tear film across your entire eye. So, what happens if there is a problem with your tears? A condition known as dry eye is the most common result of tear problems. Dry eye is a condition where you either have unstable or inadequate tears. It can affect either one or both eyes, and it causes significant discomfort.