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The corneal surface was modeled as a torus before ablation, and the corneal surface was modeled as a sphere after ablation in the myopic astigmatism eye. So the mathematic model to determine the ablation profile in LASIK or PRK was deduced according the two surfaces . The two different-radii of curvature of the torus along its orthogonal meridians were determined by the deepest and flattest section...
We modeled the corneal surface as a torus before surgery and modeled the corneal surface as a sphere after surgery to determine the ablation profile in refractive surgery. The two different-radii of curvature of the torus along its orthogonal meridians are determined by the deepest and flattest section of the corneal measure by topographic observation. The results show the model is effective to correct...
The ablation profile in transition zone for laser refractive surgery was calculated in a series of steps. First, the proper optical region shape is determined either by Munnerlyn equations or wavefront techniques. Second, a blend region may optionally be applied. The area of the ablation zone is equal to a maximum possible pupil size of the eye. Third, the depth of the ablation shape at the outer...
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