Jaskulski Matt, Singh Neeraj K, Bradley Arthur, Kollbaum Pete S
Indiana University School of Optometry, Bloomington, IN, USA.
Ophthalmic Physiol Opt. 2020 Sep;40(5):549-556. doi: 10.1111/opo.12725. Epub 2020 Aug 18.
High sampling density optical metrology combined with pupil- and image-plane numerical analyses were applied to evaluate a novel spectacle lens containing multiple small zones designed to slow myopia progression.
High-resolution aberrometry (ClearWave, www.lumetrics.com) was used to sample wavefront slopes of a novel spectacle lens, Defocus Incorporated Multiple Segments (DIMS) (www.hoya.com), incorporating many small, positive-powered lenslets in its periphery. Using wavefront slope and error maps, custom MATLAB software ('Indiana Wavefront Analyzer') was used to compute image-plane point-spread functions (PSF), modulation transfer functions (MTF), simulated images and power distributions created by the dual-focus optic for different pupil sizes and target vergences.
Outside of a central 10 mm zone containing single distance optical power, a hexagonal array of small 1 mm lenslets with nearest-neighbour separations of 0.5 mm were distributed over the lens periphery. Sagittal and curvature-based measures of optical power imperfectly captured the consistent +3.50 D add produced by the lenslets. Image plane simulations revealed multiple PSFs and poor image quality at the lenslet focal plane. Blur at the distance optic focal plane was consistent with a combination of diffraction blur from the distance optic and the approximately +3.50 D of defocus from the 1 mm diameter near optic zones.
Converging the defocused beams generated by the multiple small (1 mm diameter) lenslets to a blurred image at the distance focal plane produced a blur magnitude determined by the small lenslet diameter and not the overall pupil diameter. The distance optic located in between the near-add lenslets determines the limits of the optical quality achievable by the lens. When compared to the optics of a traditional concentric-zone dual-focus contact lens, the optics of the DIMS lens generates higher-contrast images at low spatial frequencies (<7 cycles per degree), but lower-contrast at high spatial frequencies.
采用高采样密度光学计量技术，并结合光瞳面和像面数值分析方法，对一种新型的包含多个旨在减缓近视进展的小区域的眼镜镜片进行评估。
在包含单一远用屈光力的中央10毫米区域之外，一个由1毫米小透镜组成的六边形阵列以0.5毫米的最近邻间距分布在镜片周边。基于矢状面和曲率的光焦度测量方法不能完美地捕捉小透镜产生的一致的+3.50D附加屈光力。像面模拟显示在小透镜焦平面处有多个PSF且图像质量较差。远用光学系统焦平面处的模糊与远用光学系统的衍射模糊以及直径1毫米的近用光学区域产生的约+3.50D离焦的组合一致。
将由多个小（直径1毫米）透镜产生的离焦光束在远焦平面处汇聚成模糊图像，产生的模糊程度由小透镜直径而非整个瞳孔直径决定。位于近附加小透镜之间的远用光学系统决定了该镜片可实现的光学质量极限。与传统同心区双焦点隐形眼镜的光学系统相比，DIMS镜片的光学系统在低空间频率（<每度7周）下产生对比度更高的图像，但在高空间频率下对比度较低。
