With Proclear Sphere contact lenses, you'll enjoy an unrivaled level of comfort all day long - unlike some contact lenses that can start to feel dry, itchy or make your vision blur after you've worn them for extended periods of time. This exceptional level of comfort in Proclear Sphere is made possible by PC Technology™, which creates a unique material containing molecules found naturally in human cell membranes. These molecules attract and surround themselves with water, keeping Proclear Sphere contact lenses moist and comfortable, even after 12 hours of wear.