Ares Jorge, Flores Ramón, Bará Salvador, Jaroszewicz Zbigniew
Area de Optica, Departamento de Física Aplicada, Universidade de Santiago de Compostela, Galiza, Spain.
Optom Vis Sci. 2005 Dec;82(12):1071-8. doi: 10.1097/01.opx.0000192347.57764.4c.
The purpose of this study was to evaluate the performance of quartic axicons for presbyopia compensation. The working principle relies on profiting the high depth of focus of the axicons to supplement the reduced accommodation amplitude of presbyopes.
We present the design equations of a particular kind of axicon to compensate a general presbyopia condition using simultaneous vision. A rotationally symmetric polynomial of fourth-order, corresponding to the well-known Seidel spherical aberration term, was chosen as its refractive profile. To validate its performance, we computed the retinal images with Stiles-Crawford apodization for a presbyopic eye compensated with this quartic axicon and compared them with those obtained without compensation or with other available solutions based on the simultaneous vision principle.
The quartic axicon provides an important improvement of the image quality for intermediate distance vision in comparison with conventional bifocal and trifocal solutions. The image quality, however, is still not optimum for all distances.
The results show the usefulness of the proposed approach and point out the need for developing further adapted optimizations.
本研究旨在评估四次锥镜用于老视矫正的性能。其工作原理是利用锥镜的高焦深来补充老视者降低的调节幅度。
我们给出了一种特定类型锥镜的设计方程，以通过同时视来矫正一般的老视情况。选用了一个与著名的赛德尔球差项相对应的四阶旋转对称多项式作为其折射轮廓。为验证其性能，我们对用这种四次锥镜矫正的老视眼，计算了经斯泰尔斯 - 克劳福德变迹处理后的视网膜图像，并将其与未矫正或基于同时视原理的其他现有解决方案所获得的图像进行比较。
与传统双焦点和三焦点解决方案相比，四次锥镜显著提高了中距离视力的图像质量。然而，图像质量在所有距离上仍未达到最优。
结果表明了所提方法的有效性，并指出需要进一步开发适应性更强的优化方法。
