Dry eyes are mostly caused by yin deficiency, but can also be caused by actual heat or overuse of the eyes. Yin deficiency is a deficiency of Yin fluid in the body, especially Yin deficiency of the liver and kidneys (deficiency of Yin fluid in the liver and kidneys) may cause the eyes to become dry due to the lack of Yin fluid moisturizing, and some patients may be accompanied by dizziness and blurred vision, dry mouth, lumbar and knee soreness and tenderness (a feeling of soreness and weakness of the lumbar and knees), etc., which can be treated with medications such as Liufidiyihuangwan (Six-flavored Di Huang Pills) and Qiju Juchu Di Huang Wan (Qi Ju Di Huang Pills). Dry eyes may be caused by actual heat or overuse of the eyes in addition to Yin deficiency of the liver and kidneys. If the liver fire, there may be dry eyes, eye redness, swelling and pain and other symptoms, you can take gentian diarrhea liver pill and other drugs to treat; if excessive use of the eyes may be dry eyes, should be combined with work and rest, reduce the time of using the eyes, and pay attention to eye hygiene. Patients with symptoms of dry eyes, it is recommended to go to a regular hospital, under the guidance of a professional doctor, to identify the causes, targeted treatment.