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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: Int Ophthalmol Clin. 2016 Spring;56(2):19–45. doi: 10.1097/IIO.0000000000000113

Figure 4.

Figure 4

Axial topography of an eye with a central island. The central 2 mm of the treatment zone has a power of curvature 2 to 3 diopters steeper than the surrounding corneal surface. (Image courtesy of author WJD)