Improvements in specialty lens designs have made this contact lens modality a viable option for patients who have mild to moderate keratoconus. Generally, these soft lenses have center thickness 4X greater than standard soft lenses, which allows them to mask surface irregularity caused by keratoconus. When necessary, they can be manufactured using silicone hydrogel material that increase oxygen to the corneal surface. Specialty soft lenses for keratoconus can be a successful alternative when standard GP designs fail secondary to comfort issues.
For more information, read my article on this subject that I co-authored with Dr. Eiden in Contact Lens Spectrum.
http://www.clspectrum.com/articleviewer.aspx?articleID=106552