Preussner P R, Wahl J, Gerl R, Kreiner C, Serester A
Universitäts-Augenklinik, Mainz.
Ophthalmologe. 2001 Jan;98(1):97-102. doi: 10.1007/s003470170208.
To date, approaches to restore accommodation following cataract surgery have been based on the principle of a liquid or solid implant that moves within the capsular bag and thereby changes the optical characteristics of the eye. However, these implants have been associated with shrinking and fibrosis of the capsular bag, a problem that will not be solved in the foreseeable future.
If accommodation is effected by shifting the whole capsule including its contents on the optical axis, capsular fibrosis will virtually no longer play a role. In order to execute this shift via the neuronal feedback mechanisms of the ciliary muscle in a controlled way, radial zonular forces or movements must be transformed into axial ones, which is possible by means of tiny permanent magnets. This paper describes the basic aspects of such an implant. The dependence of accommodation on all relevant parameters is quantified in a computer simulation.
The implant described appears to be practicable with justifiable technical and surgical efforts.
迄今为止，白内障手术后恢复调节功能的方法一直基于这样的原理，即液体或固体植入物在囊袋内移动，从而改变眼睛的光学特性。然而，这些植入物与囊袋的收缩和纤维化有关，这一问题在可预见的未来无法解决。
如果通过在光轴上移动整个囊膜及其内容物来实现调节功能，那么囊膜纤维化实际上将不再起作用。为了通过睫状肌的神经反馈机制以可控的方式执行这种移动，必须将放射状小带力量或运动转化为轴向力量，这可以通过微小的永久磁铁来实现。本文描述了这种植入物的基本方面。在计算机模拟中对调节功能与所有相关参数的依赖关系进行了量化。
所述植入物在合理的技术和手术努力下似乎是可行的。
