• TE-PTK Versus Topography-Guided Ablation Description: Transepithelial phototherapeutic keratectomy (PTK) is performed in three cases with irregular astigmatism from previous truncated flap creation with ablation where transepithelial PTK based on Artemis were found to be superior to topography-guided ablation simulations. Submitted by Dr. Dan Z. Reinstein (England) Subspecialty: Cornea / External Disease Level: Advanced Uploaded By: ISRS Multimedia Library