Contact lenses are lenses made of different materials according to the shape of the cornea of the human eye, which are directly attached to the surface of the tear layer of the cornea and are biocompatible with the human eye, ultimately achieving the purpose of correcting vision, cosmetology or treatment. Compared with ordinary frame glasses, it is more and more popular because it has the characteristics of beautiful wearing and not afraid of water vapor. But after wearing contact lenses for a day, many consumers will find that their eyes are red and dry, and the lenses stick to the cornea like an airtight plastic film. This is caused by insufficient oxygen permeability of traditional hydrogel contact lenses.

Due to the limitation of space, today we mainly talk about the soft corneal contact lenses that are used most nowadays. Let's take a look at the materials used in soft corneal contact lenses.

In the 1960s, scientists first synthesized polyhydroxyethyl methacrylate hydrogel materials and successfully applied them to soft corneal contact lenses. This is the well-known HEMA (2-Hydroxyethyl methacrylate) material hydrogel contact lens, which contains moisture, has the characteristics of softness, and is more comfortable to wear for a short time. However, the oxygen permeability of HEMA material is not good, it can not be worn for a long time, and the problem that water content and oxygen permeability can not be achieved at the same time can not be solved.

The birth of silicone hydrogel contact lenses is a good solution to the problem of insufficient oxygen permeability. The traditional contact lenses made of hydrogel have only one water channel for oxygen permeability, which has poor oxygen conductivity and easily leads to red eyes, astringent eyes, dry eyes and other undesirable phenomena. Silicone hydrogel contact lenses have double oxygen permeable channels of water channel and silicon channel, which can achieve high oxygen permeability, and the oxygen permeability is 6-10 times higher than that of hydrogel. Silicon is a strong oxygen-loving element, and its structure is stable enough after combining with oxygen, which is equivalent to opening the door for oxygen to pass through. It is precisely because of the strong oxygen permeability that the precipitation of protein is reduced to a certain extent. The cornea can breathe freely and metabolize normally, which fundamentally avoids the symptoms of corneal swelling and inflammation. Even if it is used for a long time, it can keep the lens clean and comfortable, and it is not easy to feel dry eyes.

What is a better contact lens material? Better wearing effect gives us a clear answer.

Materials are the foundation of industrial upgrading. The pharnorcia industry spire team has overcome a large number of technical problems and successfully developed more than 20 monomer materials needed for silicone hydrogel contact lenses. The R & D, production, sales and commercial use of more than 20 monomer materials have solved the problem of supply chain sticking neck. It is the only enterprise in China that produces ophthalmic materials and exports them to developed countries in Europe and America. Most of the materials of domestic high-end medical equipment enterprises are imported. Our company not only develops and produces materials by itself to solve the supply chain bottleneck problem, but also sells these materials to large enterprises in developed countries to verify the quality reliability. Silicone hydrogel contact lenses, pharnorcia's own material, meet the needs of healthier, safer and more comfortable users. Self-sufficient contact lens suppliers of key core materials will replace imports in an all-round way, allowing domestic users to wear silicone hydrogel contact lenses with higher quality and cost performance, which will bring revolutionary contributions to 700 million myopic users in China.

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