CURRENT TRENDS IN MODERN ORTHOKERATOLOGY

The present article describes the basic concepts and principles of mod ern orthokeratology, Early investigators postulated a variety of theor ies, However, controlled clinical studies have shown these methods to be both unpredictable and also modest in their ability to correct myop ia. These traditional techniques involved fitting lenses according to a 'rule-of-thumb' and clinicians had no means of accurately evaluating corneal topography. More recently, with the significant advances in c orneal topography systems and the application of reverse geometry lens es (lenses where the secondary curve steepens) certain investigators h ave concluded that the technique can rapidly reduce greater levels of myopia with greater predictability, The procedure involves a more scie ntific sagitta based fitting philosophy and predictability is defined according to corneal asphericity, (C) 1998 The College of Optometrists . Published by Elsevier Science Ltd.