GP Contacts for Irregular Vision Problems
GP contact lenses can correct unusual vision problems that soft lenses can't.
Trauma to the eye, corneal dystrophy, and corneal surgery including refractive surgery can result in irregular corneas. In such cases, GP lenses are often the best vision correction option.
GP contact lenses can provide unparalleled vision because the rigid nature of GP lenses creates a smoother, more regular surface.
Vision Correction After Refractive Surgery
Refractive surgery procedures such as LASIK can make the center of the cornea thinner than the cornea's outer edges (periphery). This means that the central cornea is flatter, or less curved, than the periphery. Such disparities in curvature can create less than optimal vision.
When this happens, a refractive surgery patient may need vision correction on a regular basis, even though he or she has had surgery.
The problem in this situation in addition to the disappointment experienced by someone who may have believed they were ridding themselves of glasses or contacts forever is that surgery has resulted in a corneal shape that is very irregular and difficult to fit with contact lenses.
Reverse Curve Designs
GP contact lenses are often the only choice for this situation. When the center of the cornea becomes less curved and the mid-periphery more curved, a specially designed GP lens can be used. Called a "reverse curve" design, the lens has a mid-peripheral curve that is much steeper (more curved) than the central curve.
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[Page updated February 2013]