COMPUTERIZED VIDEOKERATOSCOPES WHAT DO THE MAPS TELL US? Radial Keratotomy (RK) The corneal shape of patients following radial keratotomy (RK) can be visualized and any changes in shape with time following the surgery can be quantified. These corneas are flatter in the center and steeper in the periphery-the opposite of the cornea prior to the procedure. The maps help if additional refractive procedures are required.