In terms of material used, there are two main types of contact lenses: soft and gas permeable lenses. Each of them has its own advantages and disadvantages. Soft contact lenses are made of comfortable gel like material that just fit on the eyeball. Soft contact lenses allow for instant ease and comfort for eyes. This is the biggest advantage of soft contact lenses. As for gas permeable lenses (hard lenses) are made of plastic that allows oxygen through the lenses and to the eye beneath. So, providing more oxygen to the eye and resistant to deposits of protein which could not finish by soft lenses are the best two advantages of RGP. What's more, if you have astigmatism, RGP may be the best choice. But they also have some disadvantages, they are not comfortable as soft contact lenses, and they need more time to get used to. If you want to go out for work with RGP, you will need another period of time to get used to them.
As the name implies, soft contact lenses are made of soft flexible plastic materials. Wearing soft contact lenses, it allow oxygen to pass through to the cornea. And soft contact lenses have many forms. For example, there are disposable contact lenses that can be used at once. Then, you can throw it away. It is very clean, easy and convenient.
According to the material being used, the contact lenses are classified to soft contact lenses, rigid contact lenses, hybrid contact lenses. Soft lenses appear in the 1960s. Nowadays, the soft contact lenses are most popular contact lenses in the marketing because they are immediately comfortable once you wear them compared with rigid contact lenses. Most of soft contact lenses are made of silicone hydro gels which have high oxygen permeability of silicone and the comfort and clinical performance of the conventional hydro gels.
The soft contact lens is one kind of contact lens, which is made of soft polymer-plastic material with water. There are three main types of soft contact lenses in market, which are daily, silicone extended and high-definition ones. As we all known, water can pass oxygen through the contact lens to make more comfortable to the eyes as well as the soft contact lens. And some soft contact lenses could prevent UV rays to protect eyes. And they are short-term usage contact lenses, which can decrease the risk of infection. However, it is easier to absorb pollutant and more fragile than other hard contact lens.