Biomedics 55 premier aspheric contact lenses are designed to effectively control the average spherical aberration in the lens and human eye. Spherical aberration is the inability of a lens to focus light on a common point. That means Biomedics 55 premier contact lenses are able to focus light, providing you with clearer, crisper, sharper vision—regardless of the amount of correction required. At the same time, a rounded edge design provides excellent comfort.