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Astigmatism Basics | Jan/Feb '18

The Essentials

Video 1 | Dr. Hovanesian weighs in on which tools are essential for young surgeons who may not have access to a wide range of technologies.

Surgically induced astigmatism (SIA) can be calculated easily using resources available at  www.doctor-hill.com. On this website, Warren Hill, MD, has provided a spreadsheet that surgeons can fill in with preoperative and intraoperative parameters and then use to calculate their SIA. Alternatively, for most surgeons, a close value will be 0.10 D to 0.20 D of flattening at the temporal incision meridian.

SIA will vary between eyes and incision meridian. Of course, incision tunnel length and distance from the limbus can significantly affect the amount of flattening induced by a corneal incision.

Video 2 | Dr. Hovanesian discusses which tools are essential to astigmatism management in his practice today.

John A. Hovanesian, MD
John A. Hovanesian, MD
  • Harvard Eye Associates, Laguna Hills, California
  • Clinical Instructor, Jules Stein Eye Institute, University of California, Los Angeles
  • drhovanesian@harvardeye.com; Twitter @DrHovanesian
  • Financial disclosure: None acknowledged