Gas Permeable Contact Lenses are rigid contact lenses that let Oxygen through to keep the eye healthy and happy. Gas Perms are more irritating than Soft Contact Lenses because they are smaller and have a thicker edge which the upper lid impacts with each blink. For a new wearer the lid adapts to this and the lenses do become comfortable after a week or so. Patients with a lot of astigmatism can benefit from Gas Perm lenses and teenagers whose prescription is rapidly increasing can also be good candidates for Gas Perm Lenses. These lenses are also available in toric and multi-focal designs.