Rigid Gas Permeable Lenses (RGP)
Rigid Gas Permeable (RGP) lenses are made from hard plastics. They offer vision correction for many conditions including near-sightedness, far-sightedness, and presbyopia. They are especially ideal for patients with astigmatism or keratoconus (a corneal disorder). They sit on the eye’s cornea (clear front surface of the eye), and have a smaller diameter than soft lenses. The rigid material of RGP’s can provide clearer, crisper vision. These lenses are very durable, easy to care for, and can last for years. Allergic problems and toxic reactions are rare as RGP’s provide more deposit resistance than soft contact lenses.
Initial fitting of RGPs, however, is a more timely and precise procedure than fitting soft lenses. A "custom" fit is required for each eye. There is also a short adjustment period during which the wearer will feel the contact in the eye. Most motivated individuals will quickly adapt to the lenses.
Video Title : Contact Lens, Applying Hard Lenses