It is important to understand the difference between an astigmatism, keratoconus, and when you're looking for the right eye wear. If the soft contact lenses does not remove the problem of vision, the perpetrator may be astigmatism. Astigmatism is defect of the eye or lens, which is caused by a deviation from the spherical curvature. Defect prevents the rays of light from the meeting at a common focus, resulting in distortion. If you feel that it may have an astigmatism, rigid gas permeable (RGP) lens, it may be a better solution for you.
Keratoconus is a condition of the eye that can be normally circular in shape, the dome of the cornea thin, overtime as a bulge causing the Cone in place. If you feel that it may have keratoconus, the first step to correct the problem should be a mapping of the surface of the cornea, did. Corneal topography is irregular area on the front of the eye, preventing the lens Assembly correctly.
What is a hard contact lenses?
Soft contact lenses only lies on the cornea of the eye and the irregular surfaces such as rigid gas permeable lens fit. If you have keratoconus, rigid lens is necessary because it provides a perfect shape, the shape of the eye of the dome for football. As a result, that the light is able to concentrate on the back of the eye, giving the wearer more excellent vision as opposed to soft contact lenses.
Some patients are turned away from the rigid gas permeable lens, because they are worried about putting solid hard lens in the eye of fear that will hurt or scratch. First, it is more important in the eye of the rigid lens, so it takes a little more time to adapt. Rigid gas permeable lenses are, however, breathable, safe and deposit resistant than soft lenses.
Advantages of rigid gas permeable lens (RGP)
Rigid gas permeable contact lens is ideal for patients who have two different eye prescriptions, which is a condition called anisometropia. Status causes one eye to obtain the size of a different image than the other. RGP lenses Cut the distance, so the size of the image is more similar between the eyes.
Combine soft and hard lenses for optimum vision
For the improvement of the comfort with RGP for keratoconus is a soft contact lens wear sometimes under him. In this way, the patient feels soft lenses against their eyes and still has the Visual benefits of rigid lens. This technique, known as "piggybacking". Another type of lens used is a hybrid, where the RGP contact lens is soft edge or "skirts" to her. This allows for better comfort and crisp vision. The third technique uses the scleral lens which is bigger RGP, which covers the white part of the cornea and the sclera of the eye or. The size of the large lens wear may seem impossible, but because of the border from the edge of the lid, not felt with each blink.
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