Keratectomy. By Dimitri Azar, Roger Steinert, and Walter Stark. Philadelphia, PA: Williams and Wilkins; 1997; 214 pp. $79.00. Phototherapeutic keratectomy (PTK) has been developed to remove superficial corneal opacities and irregularities. In the foreword, Claus H. Dohlman, Professor of Ophthalmology at Harvard, whimsically asks the question, “Will a quick shave with the excimer laser solve the...