Ortho-K Lenses May Help Slow Progression Of Myopia In Kids. The San Francisco Chronicle Share to FacebookShare to Twitter (8/28, Allday) reports that special hard contact lenses “called orthokeratology, or ortho-k lenses, are one of several new techniques that vision experts are cultivating to stop, or at least slow, the progression of myopia in” youngsters. The lenses are inserted before going to bed. Overnight, the lenses gently reshape the eye, providing temporarily clear vision the following day. Even though the vision “adjustment is temporary...some studies show that the ortho-k lenses seem to slow myopia’s progression” over time.