Gas Permeable (GP) Contact Lenses These rigid lenses aren’t as popular or well-known as soft lenses, but they offer the advantages of durability, crisp vision and high oxygen permeability. Contact Lenses for the "Hard-to-Fit" Patient Challenges such as astigmatism, presbyopia, keratoconus and dry eyes needn’t be a barrier to contact lens wear, but they do require more time and patience. Orthokeratology What if you could wear contacts while sleeping, and then see clearly during the day without them? It might sound like magic, but it’s a time-tested reality called ortho-k. Bifocal and Multifocal Contact Lenses If you need correction for presbyopia but dislike the idea of bifocal eyeglasses, you have many contact lens options. Toric Contact Lenses for Astigmatism “I can’t wear soft contacts; I have astigmatism.” This once-true statement is now simply a myth.