This section explains how each lens type was developed, how they differ, and why one is usually preferred for modern eye care.
The first hard contact lenses were made from a plastic called PMMA, the same durable material used on many tool handles. These lenses were the only option for many years.
PMMA does not let oxygen pass through to the cornea. Because the cornea must receive oxygen to stay healthy, doctors began to see problems in patients who wore these lenses for long periods.
Gas permeable lenses were created to solve the oxygen issue. Made from a newer plastic blend, these lenses allow oxygen to flow freely to the cornea while still providing crisp vision.
Both lens types can correct vision, but gas permeable lenses are safer because they reduce the risk of corneal swelling, redness, and infection linked to low oxygen levels.
Many people still call gas permeable lenses hard lenses. If you tell your eye doctor you wear hard lenses, the doctor will likely assume you are using the modern gas permeable material.
Remember these quick points when thinking about lens options:
If you have questions about which lens type is best for you, our eye care team is ready to guide you. We are committed to keeping your eyes healthy while helping you see your world clearly.
