Keratoconus is a progressive eye disorder that gradually pinches the cornea, forcing it into an abnormal shape. Initially, many keratoconus patients are able to improve their eyesight by wearing standard GP lenses. As the disease advances, standard contact lenses may start to cause discomfort, and the wearer will be advised to switch to scleral lenses.
If you’ve been told you need scleral contact lenses, you likely have irregularly-shaped corneas. A misshapen cornea blocks light from entering the eye, which results in blurry vision. Scleral lenses enable people with corneal irregularities or severe dry eye to comfortably wear contact lenses. These large-diameter gas permeable (GP) lenses cover the entire cornea as well as the sclera (the “white of the eye”). As such, the diameter of a scleral lens measures between 14.5 mm to 24 mm, much larger than a standard GP contact lens.
Scleral Lens Fitting
An ICON eye care specialist will perform a detailed inspection of the curvature of your cornea when fitting you for a scleral lens. Based on this examination, your doctor will create a customized scleral lens tailored to your unique eye structure. After your scleral lenses are made, you’ll need to visit your eye care specialist several times so they can ensure the lenses fit properly. During this trial period, the size, parameters, and contour of the lenses may need to be adjusted. Since scleral lenses are much larger than normal GP contact lenses, your eye specialist will also need to teach you how to correctly insert and remove your new lenses.
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