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    • 8. 发明申请
    • PROLATE SHAPED CORNEAL RESHAPING
    • 抛光形状矫正
    • WO0124728A3
    • 2002-05-02
    • PCT/US0027425
    • 2000-10-05
    • LASERSIGHT TECH INC
    • HOLLADAY JACK TSMITH MICHAELTERRY TRAVISMARROU LANCE
    • A61B3/107A61B3/125A61F9/01A61B18/18
    • A61B3/125A61B3/0025A61B3/107A61F9/00804A61F2009/00872A61F2009/00882
    • Apparatus (300) and techniques for performing prolate shaped corneal reshaping. In accordance with the techniques, an ablation scanning (380) laser system includes fitter (320) modules to fit input refractive or topographical measurement data to a three (3) variable ellipsoid model. This provides pre- and post-operative approximations of a cornea. A desired prolate shaped ablation profile is determined based on a desired prolate ellipsoidal shape. In accordance with the principles of the present invention, the spheroequivalent ellipsoid model has only three degrees of freedom (not four as in a conventional biconic technique) to define a desired ablation profile, providing extremely accurate and predictable long term vision correction. To arrive at an ellipsoid model having only three numbers of freedom, a spheroequivalent (SEQ) value of asphericity QSEQ is generated. The spheroequivalent eccentricity QSEQ value replaces two degrees of freedom (i.e., eccentricities) in an otherwise conventional biconic modeling system, leaving only three (3) variables to determine for a best fit ellipsoidal modeling of a cornea possible, and to limit results to regular astigmatism that can be corrected with optical spherocylinders.
    • 装置(300)和用于进行长角形角膜重塑的技术。 根据这些技术,消融扫描(380)激光系统包括装配器(320)模块,以将输入折射或形貌测量数据拟合到三(3)个可变椭圆体模型。 这提供角膜前和术后近似值。 基于期望的椭圆形椭圆形形状来确定期望的长扁形切削轮廓。 根据本发明的原理,球形等效椭圆体模型仅具有三个自由度(不是传统双锥技术中的四个),以限定期望的消融轮廓,提供非常精确和可预测的长期视力矫正。 为了得到仅具有三个自由度的椭球模型,产生非球面性QSEQ的球状当量(SEQ)值。 球形等效偏心QSEQ值代替了另外传统的双锥形建模系统中的两个自由度(即偏心度),只剩下三(3)个变量来确定可能的角膜的最佳拟合椭圆模型,并将结果限于常规散光 可以用光学柱塞校正。
    • 9. 发明申请
    • ELLIPSOIDAL CORNEAL MODELING FOR ESTIMATION AND RESHAPING
    • 用于估计和修复的ELIIPSOIDAL CORNEAL建模
    • WO01024719A1
    • 2001-04-12
    • PCT/US2000/027432
    • 2000-10-05
    • A61B3/107A61B3/125A61F9/01A61B18/18
    • A61B3/125A61B3/0025A61B3/107A61F9/00804A61F2009/00872A61F2009/00882
    • The present invention provides apparatus and techniques for performing prolate shaped corneal reshaping using an ellipsoid corneal modeler. In accordance with the principles of the present invention, an ellipsoid corneal modeler (100) is implemented with the well behaved conicoid, combined with a modeled surface which can be used for astigmatic treatments. An ellipsoid corneal modeler (100) includes an ellipsoid fitter (150) which utilizes two radii of curvature, asphericity (Q), and a surface rotation about the pupil center (rotation of theta ), yielding the equation. Moreover, in accordance with the principles of the present invention, a target ellipsoid corneal surface with the applied refraction can be used to determine the required tissue removal for the given refractive change. This final shape will maintain the asphericity of the original corneal surface and therefore limit the spherical aberrations induced by the use of otherwise conventional techniques.
    • 本发明提供了使用椭圆体角膜建模器进行长角形角膜重塑的装置和技术。 根据本发明的原理,椭圆体角膜建模器(100)用良好的圆锥形实现,与可用于散光治疗的模拟表面组合。 椭圆体角膜建模器(100)包括利用两个曲率半径(非球面度)和围绕瞳孔中心(θ的旋转)的表面旋转的椭圆形装配器(150),产生等式。 此外,根据本发明的原理,可以使用具有施加的折射的目标椭圆体角膜表面来确定给定折射变化所需的组织去除。 该最终形状将保持原始角膜表面的非球面性,并因此限制由使用其它常规技术引起的球面像差。