Dry eye occurs when there are not enough tears being produced, or the wrong type of tears is being produced. A healthy tear film is important for good vision and comfortable eyes. Symptoms of dry eyes are irritation or grittiness, red eyes, blurry vision, watery eyes, and reduced contact lens comfort. Dry eyes can occur asymptomatically. There are many different causes of dry eyes including blepharitis, medications, lid structure, and screen use. Depending on the cause, dryness is treated with artificial tears, medications, warm compresses, and occasionally surgery.