Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.
Centre for Myopia Research, School of Optometry, The Hong Kong Polytechnic University, Hung Hom, Hong Kong.
Ophthalmic Physiol Opt. 2023 Sep;43(5):1125-1136. doi: 10.1111/opo.13191. Epub 2023 Jun 28.
To understand and compare the optics of two multiple segment (MS) spectacle lenses (Hoya MiyoSmart and Essilor Stellest) designed to inhibit myopia progression in children.
The optics of the two designs are presented, together with geometrical optics-based calculations to understand the impact of the lenses on the optics of the eye. Lenses were evaluated with three techniques: surface images, Twyman-Green interferometry and focimetry. The carrier lens powers and the spatial distribution, powers and forms of the lenslets were measured.
MS lenses as manufactured were found to match most of the design specifications provided by their manufacturers, although some apparent small discrepancies were found. The focimeter-measured power of the lenslets was approximately +3.50 D for the MiyoSmart and +4.00 D for the highly aspheric lenslets of the Stellest design. For both lens designs, image contrast would be expected to become modestly reduced in the focal planes of the distance-correcting carrier lenses. Images become much more degraded in the combined carrier-lenslet focal plane, due to the generation of multiple laterally displaced images formed by adjacent lenslets within the effective pupil. The exact effects observed depended on the effective pupil size and its location with respect to the lenslets, as well as the power and arrangement of the lenslets.
Wearing either of these lenses will produce broadly similar effects on retinal imagery.
了解和比较两种用于抑制儿童近视进展的多焦点（MS）眼镜片（豪雅 MiyoSmart 和依视路 Stellest）的光学性能。
介绍了两种设计的光学性能，并进行基于几何光学的计算，以了解镜片对眼睛光学性能的影响。使用三种技术评估镜片：表面图像、特文格林干涉仪和聚焦计。测量了镜片的载体屈光度和镜片的空间分布、屈光度和形式。
发现 MS 镜片在制造时符合制造商提供的大多数设计规格，尽管发现了一些明显的小差异。特文格林聚焦计测量的镜片的屈光度约为 MiyoSmart 的+3.50 D，高度非球面 Stellest 设计的镜片的+4.00 D。对于两种镜片设计，在距离矫正载体镜片的焦平面上，图像对比度预计会适度降低。由于相邻镜片在有效瞳孔内形成多个横向偏移的图像，因此在组合的载体-镜片焦平面上图像会变得更差。观察到的确切效果取决于有效瞳孔的大小及其相对于镜片的位置，以及镜片的屈光度和排列。
佩戴这两种镜片中的任何一种都会对视网膜成像产生大致相似的影响。
