| 摘要 |
Photoablatale modulator for use in Laser ablation processes on the cornea consisting of a mixture of collagen and vegetable gelatins which is formed in situ on the corneal surface to be treated. A small quantity of a solution at a temperature higher of that of the cornea is applied on the corneal surface and is shaped to form an optically centered lenticule by means of a special device. The solution solidifies at corneal temperatures and forms a rigid gel which adheres strongly on the corneal surface. A dye added in the solution enables the visual monitoring of the ablation process. The lenticular modulator produced with the disclosed method is customized to provide an ablation profile that smoothes the corneal surface and additionally removes the geometrical irregularities that may pre-exist on it. The final shape of the cornea corresponds to the shape of the mold used for the preparation of the modulator. The device used for the centering of the modulator on the ocular optical axis may include subsidiary elements that facilitate and verify the correct placement of the lenticule on the corneal surface. Gas flow nozzles for the removal of the ablation by-products may be also built-in the device. |
