Comparison of Three Corneal Horizontal Marking Techniques Using iTrace™

Before astigmatism reducing surgery, accurate corneal horizontal marking before surgery is important. Due to new corneal topographic method, iTrace™ surgical workstation, precise evaluation of corneal horizontal marking is available. In this study the investigators compared three known corneal horizontal making techniques and evaluate accuracy of each methods using iTrace™.

Inclusion Criteria:

• Patients who were scheduled to have cataract surgery
• Age between 50 to 85 years

Exclusion Criteria:

• With an underlying corneal or conjunctival disorder