In clinical practice, if a patient has dry eyes, saline drops should not be used in general. Dry eye is a very common eye disease in recent years in the ophthalmology clinic. When a patient has dry eye, the main symptoms are dryness and foreign body sensation in the eyes, and some patients even experience eye pain and blurred vision. Clinical treatment of dry eye is usually topical use of artificial tear drops without preservatives to spot the eyes. During the treatment period, patients are advised not to use electronic products for long periods of time and to avoid working or studying in air-conditioned rooms for long periods of time. Generally speaking, when a patient has dry eye, the patient’s symptoms can be relieved by topical medication. However, if the patient has dry eye, it is not possible to use saline drops for the eyes, and using saline drops for the eyes will lead to further aggravation of the patient’s condition.