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Gas Permeable (GP) Contact Lenses:


There is another category of contact lens materials: gas permeable (GP) contact lenses, also known as RGPs, rigid gas permeable, or oxygen permeable lenses.

GP contact lenses are rigid, but they shouldn't be confused with old-style "hard" contact lenses, which are now obsolete. Hard contact lenses were made of a material known asPMMA. The problem with PMMA lenses is that they are difficult to get used to and somewhat uncomfortable to wear. Also, PMMA does not allow oxygen to pass through it, and healthy eyes need plenty of oxygen.One big difference between soft lenses and GP lenses is their size: GP lenses have a smaller diameter.

Most GPs incorporate silicon which makes them more flexible than PMMA. And silicone is oxygen permeable, so oxygen can pass through GP lenses, resulting in greater comfort and better eye health. In fact, GPs transmit more oxygen to the eye than do traditional soft contact lenses (although some newer silicon hydrgel soft lenses are comparable to GPs in oxygen transmission).

GPs can also provide better vision, durability, and deposit resistance than soft contact lenses. They can be easier to clean, and since they're long-lasting, they can be less expensive in the long term than soft lenses.





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