Rigid gas permeable contact lenses
RGP lenses are made of a hard plastic material. They provide very clear crisp vision. They can be a good option if you have a very high prescription, or if you have astigmatism or keratoconus.
RGP materials can be made permeable to gases so are a healthy option for the eye. As they as less flexible than a soft lens they can sometimes take several weeks for the eye to get used to the lenses.
The RGP lenses normally last 12-18 months, though sometimes longer with good care.
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