• ISRS Course: Decision Tree: When PRK & When LASIK Description: Dr. Marguerite B. McDonald discussed the Decision Tree: When PRK and When LASIK at the ISRS Course: Introduction to Refractive Surgery for Residents presented at the Academy's 2012 Annual Meeting in Chicago. (Submitted by the ISRS) Subspecialty: Refractive Management / Intervention Level: Beginner Uploaded By: ISRS Multimedia Library