Photo-ablative Refractive Keratectomy (PRK)
This is a new technique, using a laser, for changing refraction. The long-term implications are as yet unknown. The requirements for assessing stability after radial keratectomy outlined above should be followed after photo-ablative refractive keratectomy.
I also saw this text when researching the subject. Seems to me CASA is a little behind the times on the subject.