Jaisankar Durgasri, Back Arthur
Brien Holden Vision Institute Limited, Sydney, New South Wales, Australia.
School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia.
Optom Vis Sci. 2025 Jul 1;102(7):427-435. doi: 10.1097/OPX.0000000000002274. Epub 2025 Jun 26.
Simultaneous vision multifocal lens wearers face visual compromise from multiple optics covering the pupil. Modified monovision designs mitigate this by biasing eyes for distance/reading vision. Understanding designer-created bias from over/under correction, as presented in this paper with MyDay, helps practitioners assess contributions from refractive blur on wearer-reported visual symptoms.
The aim of the study is to evaluate the in-vitro power profile of a new multifocal contact lens with 3 addition powers utilizing a modified monovision approach (MyDay multifocal, CooperVision) and compare it with other commercial multifocal lenses (Proclear and Clariti, CooperVision).
The in-vitro power profiles (n = 2 per power and add) were evaluated for +0.00 D, ±1.00 D, ±3.00 D, and ±5.00 D in low, medium, and high adds MyDay lenses, single add Proclear and high add Clariti using NIMO TR1504 (Lambda-X).
Low and medium add MyDay showed similar and progressive radial power profiles with maximum plus power at the center with no distinct power zones (similar to Proclear). The average power change over 2.4 mm was +1.20 D for both adds but the medium add was offset by +0.50 D indicating overcorrection of the far point in nondominant eyes. High add MyDay showed three distinct annular power zones (similar to Clariti) with maximum plus in the central zone (2.0 mm) and stepped down across the annular zones (2 × 0.7 mm) to the peripheral (distance) zone (1.3 mm) by an average of +2.40 D over the 2.4 mm half-chord. High add MyDay showed significant power change across the peripheral (distance) zone both within a lens and across the labeled powers due to spherical aberrations.
MyDay multifocal 3-addition contact lenses have radial power profiles similar to Proclear lenses (MyDay low and medium adds) and Clariti high add lenses (MyDay high add). The uncorrected spherical aberration in the peripheral distance zone may result in patient fitting inconsistencies and increased visual disturbances.
同时视多焦点镜片佩戴者面临因覆盖瞳孔的多种光学结构而导致的视觉妥协。改良的单眼视设计通过使眼睛偏向远用/近用视力来减轻这种情况。理解本文中以MyDay为例的设计所造成的过矫/欠矫偏差，有助于从业者评估屈光性模糊对佩戴者报告的视觉症状的影响。
本研究的目的是使用改良的单眼视方法（MyDay多焦点镜片，库博光学）评估一种具有三种附加屈光度的新型多焦点隐形眼镜的体外屈光度分布，并将其与其他商业多焦点镜片（Proclear和Clariti，库博光学）进行比较。
使用NIMO TR1504（Lambda-X）评估低、中、高附加屈光度的MyDay镜片、单附加屈光度的Proclear镜片和高附加屈光度的Clariti镜片在+0.00 D、±1.00 D、±3.00 D和±5.00 D时的体外屈光度分布（每种屈光度和附加屈光度各2个样本）。
低附加屈光度和中附加屈光度的MyDay镜片显示出相似且逐渐变化的径向屈光度分布，中心为最大正屈光度，无明显的屈光度区域（类似于Proclear）。两种附加屈光度在2.4毫米范围内的平均屈光度变化均为+1.20 D，但中附加屈光度偏移了+0.50 D，表明非主导眼的远点存在过矫。高附加屈光度的MyDay镜片显示出三个明显的环形屈光度区域（类似于Clariti），中心区域（2.0毫米）为最大正屈光度，在环形区域（2×0.7毫米）逐渐降低，到周边（远用）区域（1.3毫米）在2.4毫米半弦长范围内平均降低+2.40 D。由于球差，高附加屈光度的MyDay镜片在镜片内部以及不同标称屈光度之间的周边（远用）区域均显示出明显的屈光度变化。
MyDay三附加屈光度隐形眼镜的径向屈光度分布类似于Proclear镜片（MyDay低附加屈光度和中附加屈光度）和Clariti高附加屈光度镜片（MyDay高附加屈光度）。周边远用区域未矫正的球差可能导致患者配镜不一致并增加视觉干扰。
