This group of lenses includes hard and soft contact lenses that cover an irregular cornea. The cornea needs to be smooth and symmetrical to afford good vision. Corneas can become distorted due to a variety of diseases and degenerative conditions, such as in keratoconus. Or, the cornea may have become scarred form disease or trauma. Unfortunately, a rare cornea condition occurs after refractive surgery that causes the cornea to become distorted. These can often be addressed with a variety of gas permeable hard lenses. Lens designs like the McGuire Lens, the Rose K, the reverse geometry, and the scleral lenses are all used to address these conditions.
In these case, patients cannot see well with conventional glasses and contact lenses are the only option, Dr. Gording has been able to successfully fit lenses for patients who would have otherwise required a corneal transplant.
This category of contact lenses can sometimes be identified as medically necessary contact lenses by some insurance carriers. Usually, the criteria of “medically necessary” means that the best corrected vision in the affected eye is 20/70 or worse with glasses.