Specialty lenses are designed specifically to overcome eye and vision issues. They have transformed vision options for many patients. There are numerous types of specialty contact lenses, including scleral lenses.
Scleral lenses are larger in diameter and custom fit to the specific curvature of each eye. They vault the cornea and rest lightly on the white part of the eye, the "sclera". This allows for improved comfort and stability. The lens vaults over the cornea and fluid fills the space between the back of the lens and the corneal surface keeping the surface of the eye moisturized. This fluid reservoir also helps create a smooth and clear refractive surface by filling in the irregular curvatures and abnormalities that can cause distortion and poor visual quality.
Scleral lenses are gas permeable, which means that oxygen can pass right through them and reach the surface of the eyes. This is important for comfort, particularly for patients who experience dry eyes. The fluid reservoir between the back of the contact lens and the front surface of the eye can also trap tear film, which will keep the eyes moist and healthy.
Who Are Scleral Lenses Recommended For?
Technically anyone can wear and benefit from scleral lenses, they are particularly a good option for patients who have eye conditions or irregularities when regular soft contact lenses are not suitable. This includes patients with:
Irregular Corneas. The cornea is the clear dome that covers the front part of the eye and many people have a cornea that is slightly or significantly irregular in shape. This causes light to be refracted incorrectly when it enters our eyes, triggering vision problems. Issues arising from irregularly shaped corneas cannot be completely corrected using glasses or convention contact lenses. Therefore, scleral lenses, which provide sharper and more accurate visual acuity, are recommended.
Dry Eyes. Contact lenses float on a fine layer of tear film, which keeps them comfortable and in position. Patients with dry eyes either do not have enough natural tear film and can make wearing regular contact lenses difficult and uncomfortable. However, the design of scleral lenses keep moisture on the surface of the eyes, eliminating some of the effects of dry eyes. This makes scleral lenses a great choice for patients with dry eyes.