Centration axis in refractive surgery.
Centration axis in refractive surgery.
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DOI：
10.1186/s40662-015-0014-6
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
McAlinden C
中科院分区：
文献类型：
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作者：
Arba Mosquera S;Verma S;McAlinden C
人眼是一个非对称的光学系统，而真实的角膜不是一个旋转对称的体积。眼睛中的每个光学元件都有自己的光轴和神经轴。对于许多可用的方法，定义激光烧蚀的最佳中心是困难的。我们解释了各种中心的方法（基于这些参考轴）在屈光手术，并审查其临床结果。视线（LOS）（将入射瞳孔中心与注视点连接的线）通常是用于表示整个眼睛的波前像差的推荐参考轴（从几何光学中的主光线的定义导出）;然而瞳孔居中可能是不稳定的并且随着瞳孔大小而改变。角膜顶点（CV）代表稳定的优选形态学参考，其是与视轴对准的最佳近似。然而，角膜光反射可以被认为是非恒定的，但取决于眼睛相对于光源的注视方向。以瞳孔和CV为中心的消融之间的折衷以不对称偏移的形式出现，其中，显性屈光以CV为参考，而高阶像差以瞳孔中心为参考。需要在准分子激光系统中灵活地选择对中，以最佳地设计定制和非定制治疗。
The human eye is an asymmetric optical system and the real cornea is not a rotationally symmetrical volume. Each optical element in the eye has its own optical and neural axes. Defining the optimum center for laser ablation is difficult with many available approaches. We explain the various centration approaches (based on these reference axes) in refractive surgery and review their clinical outcomes. The line-of-sight (LOS) (the line joining the entrance pupil center with the fixation point) is often the recommended reference axis for representing wavefront aberrations of the whole eye (derived from the definition of chief ray in geometrical optics); however pupil centration can be unstable and change with the pupil size. The corneal vertex (CV) represents a stable preferable morphologic reference which is the best approximate for alignment to the visual axis. However, the corneal light reflex can be considered as non-constant, but dependent on the direction of gaze of the eye with respect to the light source. A compromise between the pupil and CV centered ablations is seen in the form of an asymmetric offset where the manifest refraction is referenced to the CV while the higher order aberrations are referenced to the pupil center. There is a need for a flexible choice of centration in excimer laser systems to design customized and non-customized treatments optimally.