Ortho K lenses can control the progression of myopia. Ortho K is also a non surgical way to improve vision by altering the shape of the cornea while you sleep so that you can have clear vision throughout the day. Scleral contact lenses are the only device that can improve vision on uneven corneas eg: keratoconus, corneal transplants, high astigmatism in children or adults when glasses does not give optimal vision.