Percent Tissue Altered: The Story of Its Significant Role As a Risk Factor for Ectasia

Santhiago, Marcony

Percent Tissue Altered: The Story of Its Significant Role As a Risk Factor for Ectasia

Friday, April 17, 2015

KIOSKS (San Diego Convention Center)

Marcony R. Santhiago, MD, PhD

J. Bradley Randleman, MD

Steven E. Wilson, MD

David Smadja, MD

Glauco H. Reggiani Mello, MD

Beatriz Gomes, MD

Percent Tissue Altered (PTA) is derived from the equation [(flap thickness + ablation depth)/preoperative corneal thickness] or PTA = [(FT + AD)/CCT]. This video reveals the higher association of PTA with the occurrence of post-LASIK ectasia in eyes with normal preoperative corneal topography compared to other recognized risk factors.