Successful surgical treatment of ocular astigmatism requires accurate characterization of both magnitude and axis of the astigmatism. Keratometry and topography are clinically widely used for this measurement; however, their analysis is limited to the anterior corneal surface. Unlike these techniques, optical coherence tomography (OCT) offers the advantage of measuring both the anterior and posterior corneal surface contributions. We present a technique to combine the local curvatures of both surfaces into a single pseudosurface suitable for clinical application. Building on prior work in distributed scanning OCT (DSOCT) to remove corrupting patient motion artifacts, we present the results of a pilot patient study where extracted values of clinical corneal astigmatic power magnitude and direction from DSOCT corneal volumes were comparable to standard clinical measures of corneal astigmatism.
© 2013 Optical Society of America
Original Manuscript: November 16, 2012
Revised Manuscript: March 4, 2013
Manuscript Accepted: March 5, 2013
Published: April 1, 2013
Vol. 8, Iss. 5 Virtual Journal for Biomedical Optics
Ryan P. McNabb, Anthony N. Kuo, and Joseph A. Izatt, "Quantitative single and multi-surface clinical corneal topography utilizing optical coherence tomography," Opt. Lett. 38, 1212-1214 (2013)