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Horizontal B-Scans
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Geometrically corrected horizontal B-scans through the visual axis of a cornea before (A above) and 4 months after LASIK (B - below). The epithelial and posterior corneal boundaries are clearly visualized from one end of the corneal scan to the other, spanning a 9-mm diameter of cornea. After LASIK, the additional acoustic interface produced by the interface between the stromal component of the flap and posterior residual stroma is clearly visualized along it's entire trajectory; This interface can be seen with an entrance track temporally (E) , coursing nasally first deepening, and then becoming more superficial (T) until finally coming to a stop at the flap hinge (H). The keratome entrance point, with a small separation in the cut ends of Bowman's layer under the epithelium is evident (E); A small irregularity in the smoothness of the keratome track can be appreciated (I). |
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