A gas permeable lens refers to a type of contact lens made from a rigid, oxygen-permeable material. Also known as GP lenses or RGP lenses (rigid gas permeable), these lenses allow the passage of oxygen through their surface to the cornea, thereby maintaining the eye's health and promoting comfort. Gas permeable lenses are distinct from soft contact lenses, which are made from a hydrogel material that is less breathable.
These lenses are created with a precisely fitted, rigid material, allowing them to retain their shape on the eye. They offer excellent vision correction by correcting various refractive errors such as myopia (nearsightedness), hyperopia (farsightedness), astigmatism, and presbyopia. Gas permeable lenses also provide sharp vision by allowing light to refract more accurately through their stable surface.
Due to their rigid nature, gas permeable lenses are inherently more durable and resistant to protein and lipid deposits than soft lenses, making them less prone to eye infections. However, initially, they may take some time for the wearer to adapt to due to their structure and potential initial discomfort, but proper fitting and adjustments can alleviate this.
Overall, gas permeable lenses are recommended for individuals seeking excellent visual acuity, long-lasting lens durability, and better ocular health through enhanced oxygen permeability. They are particularly suitable for patients with irregularly shaped corneas, such as those with astigmatism or keratoconus.
