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. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: J Cataract Refract Surg. 2015 Mar;41(3):511–526. doi: 10.1016/j.jcrs.2014.08.033

Figure 3.

Figure 3

The UBM image analysis of a convex (A) and concave (B) calibration surface. The y-axis tick marks superimposed on the images represent the y-axis pixel positions in the UBM images. The measured radius of curvature of the convex surface (C) and is compared with that of the concave surface (D) as a function of vertex distance. The circled points represent the 2 corresponding images in A and B above. The actual radius for the convex surface and the concave surface was calculated at vertex-y pixel positions of 287.39 and 386.04, respectively (dashed lines). Calibration functions for the convex (E) and concave (F) calibration surfaces. Note that E includes 1 acrylic ball and 4 contact lenses.