基于达曼波带片的多焦点人工晶体设计

Design of Multi-Focal Intraocular Lens Based on Dammann Zone Plate

提出了一种多焦点人工晶体的设计方法,即将达曼波带片作为光学部刻入单焦点人工晶体表面。达曼波带片由一系列的同心圆环构成,是将达曼光栅的位相调制思想引入传统波带片而形成的一种实用光学元件。经过对衍射级次的调制,它能在聚焦透镜后方光场处产生一系列的轴向焦斑分布。通过结合不同数值孔径的聚焦透镜,焦斑的强度分布也会有一定比例的变化。通过理论模拟和实验验证,为多焦点人工晶体的制作提供了一种有效的设计方法。该多焦点人工晶体拥有五个焦点,能够同时提升白内障患者在不同距离视物时的视力,并为他们提供更加清晰细致的成像效果。

In this paper,a design method of multi-focal intraocular lens is proposed.Dammann zone plate,which consists of a series of concentric rings,is a practical optical element which introduces the phase modulation idea of Dammann grating into the traditional band plate.Through modulating the diffraction order,it can produce a series of axial focal spot distribution in the light field behind the focusing lens.Moreover,by combining the focusing lens with different numerical apertures,the intensity distribution of the focal spot will also change to a certain extent.Through theoretical simulation and experimental verification,it provides an effective design method for fabrication of multifocus intraocular lens.The multi-focus intraocular lens has five focal points,which can improve cataract patients’ vision at different distances simultaneously and provide them with clearer and more detailed images.