Biomedics® 55 Premier aspheric contact lenses are designed to effectively control the average spherical aberration in the lens and human eye. What is spherical abberation? This is the inability of a lens to focus light on a common point. Biomedics® 55 Premier aspheric contact lenses focus the light, which will provide you with clearer, crisper, sharper vision - regardless of the amount of correction required. The lens features a rounded edge design, which helps provide exceptional comfort.