Biomedics® 55 Evolution aspheric contact lenses are design to effectively control 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 Evolution contact lenses are able to focus light, providing clearer, crisper, sharper vision - regardless of the amount of correction required. At the same time, a thinner, patented edge design provides excellent comfort. Biomedics 55 Evolution delivers better vision, comfort, and proven performance.