渐进多焦点自由曲面镜片非对称设计內移量对光学性能影响的研究

Research of different internal offset values on asymmetric design for optical performance of progressive addition freeform lenses

探究渐进多焦点自由曲面镜片非对称设计过程中,内偏移量对镜片光学性能的影响。推导人眼在观察物体时,双眼汇聚而内转的偏移量计算公式。仿真在同等参数条件下,为实现左右眼平衡设计及在视觉生理上的视像对称,渐进多焦点自由曲面镜片下加光区四种不同的内偏移量产生的光焦度和散光分布图。通过仿真结果得出,不同的内偏移量对镜片的光焦度和散光分布有一定的影响,特别是周边像散区的分布大小;渐进多焦点自由曲面镜片的内偏移量应根据屈光不正患者实际的验光参数计算得到。

To research the influence of different internal offset values for the optical properties of progressive addition freeform lenses on asymmetric design.Calculation formula of the internal offset value is deduced when the human eye observed the object.In order to achieve the left and right eye balance design and visual physiology of the video symmetry,the power and astigmatism distribution maps of the down addition viewing zone for progressive addition freeform lenses with four different offset values were simulated in the same parameters.According the simulation power and astigmatism maps of four lenses by FFV software based on Moire deflection.It is indicated that there is a certain impact for the lenses of the optical power and astigmatism distribution with the different internal offset values,especially the size of astigmatism distribution in the peripheral zone.The internal offset values of progressive addition freeform lenses should be calculated based on the actual optometry parameters of the patient with refractive error.