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Registration of 3-D-Corneal Elevation Maps to Control Ablation and Centration during Refractive Laser Surgery
Schründer S., Fuchs H., Spasovski S., Dankert A.,
BioShape AG (Berlin)
Purpose: To demonstrate the feasibility of a method to register 3d elevation data of the stromal surface during refractive laser surgery. The registration serves to align single measurements during surgery to evaluate the ablated tissue volume. It can also help to better center the treatment over the visual axis.
Method: Pig corneae were measured with a uv fringe projection system before and after laser treatments. The eyes were moved and tilted to simulate the natural eye motion. Difference maps were generated using specific registration algorithms. Measurements on test lenses and simulations were used to identify the influence of other parameters on the measurement and registration accuracy.
Results: Height maps were generated to an accuracy of ±1µm depending on the image quality. Maps were registered to within ±5µm.
Conclusions: The feasibility of an efficient registration of 3d corneal surface data was shown. This is mandatory to calculate the ablated tissue volume during laser surgery. It also allows centering the ablation accurately. Using the method on a broad basis requires an incorporation of the technology into the medical laser system or into the diagnostic device.