Which material is better for contact lenses?

Since contact lenses can be soft or hard, their materials are also different. Most people buy soft contact lenses in optical shops. The materials of soft contact lenses are also differentiated. There are two types: hydrogel and silicone hydrogel. Most of the glasses on the market are made of hydrogel, but people don’t know much about these two materials. So which contact lens material is better?

There are two types of soft contact lenses: hydrogel and silicone hydrogel. There are many types of hydrogel contact lens materials, and non-ionic materials such as HEMA and Polymacon are all classified as hydrogel contact lenses.

Which material is better for contact lenses?

Contact lenses made of hydrogel and silicone hydrogel have their own strengths, and it is difficult to say which one is better. The physiological characteristics of each person's eyes are different, and each person has their own suitable material. In terms of comfort, hydrogel contact lenses are relatively soft, elastic, and have better wettability than silicone hydrogel lenses, making them easier for wearers to adapt to.

Contact lenses made of hydrogel materials are relatively soft, and their oxygen permeability is closely related to their water content. Lenses with high water content generally have higher oxygen permeability. However, due to the high water content, the lenses will absorb moisture from tears, and the eyes will feel dry more easily. This is the limitation of hydrogel contact lenses.

Silicone hydrogel contact lenses are relatively not as soft due to their lower water content. First-time wearers may feel a foreign body sensation and need a longer time to adapt to the lenses. However, silicone hydrogel lenses have a high oxygen permeability, five times that of ordinary contact lenses. Because they can directly transmit oxygen from the air, they are more suitable for people whose eyes often feel dry.

Silicone hydrogel contact lenses are a bit harder, and you may feel a foreign body sensation in your eyes when you first wear them, but the lenses have good oxygen permeability and are not prone to dehydration, so they are quite comfortable to wear. For contact lenses made of silicone hydrogel material, there are many tiny "channels" in the material matrix, which facilitates the free passage of gas molecules, ions and water molecules through the lenses, and have high oxygen permeability.

The two materials of contact lenses each have their own advantages and disadvantages. Contact lens users should make a reasonable choice. Choosing the one that suits them is important and good.