What material are contact lenses made of?
The materials of contact lenses are silicon hydrogels and hydrogels, and both of these materials are organic polymer materials with excellent hydrophilicity. Today, let's take a closer look at the materials of these two contact lenses.
The design concept of contact lenses in the beginning is to hope that the lens can be worn directly on the eyeball, so the requirements for lens materials are very strict. Qualified contact lenses should be soft and comfortable, keep wet, anti-precipitation, good biocompatibility, but also stable, durable, strong oxygen permeability, more importantly, in order to correct the problem of refractive errors, contact lenses must also provide clear and accurate optical effects for the wearer, which has high requirements for light transmittance and refractive index. Hydrogels and silicon hydrogels fully meet all the relevant property requirements.
However, in the process of making contact lenses, we gradually found that some characteristics will contain each other. For example, the oxygen permeability of hydrogel contact lenses will be limited by the water content, so in order to further improve the oxygen permeability coefficient, the silicon content is increased on the basis of raw materials, which is the birth of silicon hydrogel contact lenses. Silicone hydrogel contact lenses are a very important innovation because they are highly permeable to oxygen without being affected by water content, but the increase in silicon also increases the hardness of the lenses and makes it easier to adsorb protein precipitation.
The price difference between hydrogel and silicone hydrogel contact lenses is relatively large, the general price of silicone hydrogel is more expensive, if the pursuit of eye health, silicone hydrogel contact lenses are the first choice. However, even if you buy silicone hydrogel contact lenses, you can not ignore the cleaning of the lenses!