Dry eye is a kind of disease caused by the abnormal amount or quality of tears, which leads to the instability of intima and the damage of ocular surface, resulting in eye discomfort. At present, there are many factors that cause dry eye, such as computer vision syndrome and vitamin A deficiency. Dry eye can be divided into dry eye caused by insufficient tears and dry eye caused by evaporation. The former can mainly be treated with artificial tears. Polyvinyl alcohol (PVA) is a high molecular polymer, which is hydrophilic and film-forming. At a suitable concentration, it can play a role similar to artificial tears. Artificial tears can imitate human tears, and local use can improve the humidity and lubrication ability of eye surface and eliminate eye discomfort, thus achieving the effect of treating dry eye. The price of polyvinyl alcohol eye drops is the first artificial tear that is closest to human body in China. It is a new drug approved by the State Administration of Pharmaceuticals after years of clinical research by experts from the National Ophthalmology Drug Production Base. It has the effects of cooling, relieving itching, relieving asthenopia, promoting eye nutrition, keeping eyes moist and sanitary, and avoiding conjunctival congestion. It can prevent and relieve discomfort such as blurred vision, dry eyes, astringency, itching, pain and foreign body sensation caused by computer operation, reading and watching TV for a long time. Avoid eye pain, swelling or vision loss caused by visual fatigue; Prevent conjunctival congestion, dryness, astringency, itching and pain caused by swimming, dust or sweat entering the eyes; But also has multiple effects of relieving asthenopia, nourishing and moistening, cleaning and guarding, resisting bacteria and inhibiting bacteria, astringing and relieving itching, and is the first choice for treating and protecting eyes. Clinically, it is often used to prevent or treat eye irritation symptoms and effectively improve eye dryness symptoms. Generally speaking, the quality of a business is evaluated from two aspects: product quality and service. And Kangzhijia online pharmacy can give you safe and assured drug quality, caring service attitude and timely logistics speed.