What is Silicone Hydrogel Contact Lenses ?
Silicone hydrogel is a kind of organic polymer material and could be used for making contact lens, which is the currently recognized contact lens material with high oxygen permeability. Combined with hydrophilia and softness of the traditional hydrogel material as well as complement of the deficiency of oxygen permeability, silicone hydrogel contact lens could provide better guarantee for the eye health. Today, let us learn something about the silicone hydrogel contact lens.
Corneal contact lens has developed all the way up to now and silicone hydrogel is a huge breakthrough in the aspect of material and process. In the past, hydrogel contact lens had occupied the mainstream of the market. The contact lens is with good hydrophilia and very comfortable while wearing, but it has its own weakness, which means faster evaporation of water and easily causes dry eyes. On the basis of traditional hydrogel, it combines the component of the silicon. Owing to the fact that the oxygen has very high solubility in the silicon, it makes the oxygen permeability no longer purely depend on the water content, which solves well the problem of the water evaporation of the contact lens.
The process of removing the silicone hydrogel contact lens is consistent with the normal contact lens. But, because the contact lens is more watery and smooth, maybe it is a little more difficult to remove. We could make the contact lens move from the pupil to the white of the eye, then use thumb and index finger to clamp. Keeping the finger dry could increase the force of friction and make the removal easier. But attention should be paid to escape from scratching the contact lens or the cornea while using the fingernail.
Then, whether the silicon hydrogel also has its weakness or not ? The answer is yes. The material of silicon hydrogel could more easily precipitate lipid and protein. As time went on, it will affect the wearing effect and degree of comfort. Hence, silicone hydrogel contact lens is generally short-cycle disposal contact lens. Through the detailed introduction, we have a better understanding of the silicon hydrogel and hope we could purchase the contact lens suitable to ourselves.