| 摘要 |
A method for separating lamellae in the stroma of an eye includes establishing a focal depth that will be located in relatively weaker tissue at an interface layer between lamellae in the stroma. A laser beam can then be focused to photoablate stromal tissue and create a photoablative response thereto. This photoablative response is then compared to a reference value using wavefront analysis techniques to determine an effective minimum energy level for the laser beam. Maintenance of a proper focal depth can be periodically verified by maintaining a birefringent reference using an ellipsometer. Once the lamellae are separated, a flap of corneal tissue can be created that can be lifted to expose underlying stromal tissue for further surgical photoablation.
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