Peri-operative intrastromal corneal segmentation after creation of corneal cuts based on laser induced optical breakdown: A perspective study | Journal of the European Optical Society-Rapid Publications

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Figure 9

(b) identifies the transition zones of (a), as the regions within the posterior fit curvature alters from convex to concave corresponding to a sign change of the 2nd order gradient. (c) illustrate the hinge angle detection (on flap cuts) using a similar rationale. The black dashed lines illustrate $\vec{A}$ $\vec{A}$ and $\vec{B}$ $\vec{B}$ to determine θ.

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