RIGID GAS PERMEABLE
WHAT ARE RIGID GAS PERMEABLE (RGP) LENSES ?
Rigid gas permeable contact lenses (RGP) are made of a durable rigid, oxygen permeable plastic. They can come in many sizes but all are smaller than the iris (the colored portion of your eye), and they sit gently on a layer of tears that is in front of the cornea (the clear anterior surface of the eye).
RGP lenses have the unique ability to mask a multitude of visual irregularities due to corneal astigmatism, corneal scarring, conditions of the cornea including keratoconus, post-surgical abnormalities, and many more.
The tear film is what makes the vision so clear when wearing RGP lenses. Below the RGP lens, tears fill in anterior surface irregularities and create essentially a "new"corneal surface that is smooth and allows light rays to hit the retina in a straight line. Even people with no corneal issues can benefit from the intense clarity of these lenses.
HOW LONG DO RGP LENSES LAST?
Rigid gas permeable contact lenses can last for as long as: your corneal shape doesn't change, your prescription doesn't change, and the material remains unscratched. These lenses are very high quality and an excellent investment in clear, comfortable vision.
Unless there are change, we usually recommend getting a new pair every two years as well as having backup pair, especially if you have an ocular condition and rely on these lenses to see.
WHO CAN BENEFIT FROM RGP LENSES?
1.) Anyone who feels they cannot see clearly with conventional soft lenses.
RGP lenses has the unique ability to minimize any imperfections on the front surface of the eye, including astigmatism or very mild corneal dystrophies.
For some people, soft contact lenses just do not provide the clarity they are hopeful for, especially when fit with a multifocal lens (lenses for distance and near). These lenses offer superior optics.
2.) Ocular conditions with irregular corneas such as : keratoconus, corneal transplants, radial keratotomy, corneal scarring, etc.
Irregular corneas bend light rays so they are unable to reach the retina in a straight line, making images distorted and blurry. For this reason, glasses are ineffective because once the light rays go through the glasses, they still are obscured by the cornea.
RGP lenses are a great option to restore vision to people with irregular corneas. Between the keratoconic cornea and the lens, the liquid "fills in" the irregular surface to create a "new" corneal surface, where light can pass through clearly to the retina.
3.) High Prescriptions: High Myopia (Nearsightedness) or High Hyperopia (Farsightedness)
Those with very high prescriptions are sometimes unable to be fit with conventional soft contact lenses. RGP lenses can be designed with extremely high prescriptions, providing a correction that would be superior to glasses and soft contact lenses for these patients.