Widefield epithelial thickness mapping (ETM) with Optovue Avanti optical coherence tomography (OCT) has been recognized as an important addition to topography and tomography for screening candidates for refractive surgery.
Investigators recently concluded that the corneal ETM patterns in eyes with one mild topographic or tomographic abnormality were similar to the patterns observed in normal eyes in patients with myopia.
This is an important observation when considering the number of candidate patients seeking LASIK or PRK. According to Ella Faktorovich, MD, topography and tomography are the mainstays of screening patients for corneal refractive surgery.
“Diagnostic decisions are easy to make in patients with clearly discernible abnormalities, such as significant inferior or central steepening, skewed astigmatism axes, very thin corneas, and significant posterior float,” she said. “The presence of these problems typically prevents patients from undergoing LASIK and possibly even PRK depending on the severity of the abnormality.”
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