More and more people nowadays are experiencing dry eye symptoms, but they may not know that it is dry eye or that it can be treated. First, what is dry eye? The surface of our cornea is covered with a layer of tear film, which plays a role in lubricating and protecting the cornea, removing bacteria through circulation, and also maintaining clear vision. If for any reason there is a decrease in tear secretion, or a decrease in quality, it can cause dry eye symptoms. The tear film is divided into three layers, from front to back, respectively, the lipid layer (that is, a layer of oil, covering the surface, preventing tears from evaporating too quickly), the middle when the aqueous layer, the innermost contact with the corneal epithelial cells is the mucin layer, is to ensure that the tears can evenly cover the corneal surface. If any part of the lack of mucin, this part can not cover the tears, the cornea is dry. Second, what can cause dry eye? Any disease or behavior that causes a decrease in tear secretion or an increase in evaporation can lead to dry eye, and in severe cases, can lead to ocular lesion damage. However, looking at computers, cell phones, and staying up late for long periods of time can usually lead to dry eye. This is because the eye blinks on average at least 6 times per minute. If the number of blinks is significantly reduced when looking at a computer and other concentration, this leads to a large amount of evaporation of the tear film, which can lead to corneal exposure and dryness, which can cause irritation, and in severe cases, can lead to corneal epithelial breakage and infection. Therefore, looking at cell phones and computers should not last too long, and should generally take a break every half hour. If you can read down 30 degrees angle, it will reduce the degree of dry eyes than upward looking at the computer. In addition, air-conditioned environment, heating environment, pay attention to air moisturizing, otherwise dry eye symptoms will also occur. Third, how to treat dry eyes? You need to find a professional doctor to diagnose and guide. However, it is important to remember not to just buy eye drops to use! Because in order to prevent the open eye drops from being contaminated, most of the eye drops have preservatives in them, which can lead to toxic damage to the eyes when applied for a long time. You should use preservative-free eye drops, which are only available in regular hospitals, and don’t trust any products like eye wash.