de Gracia Pablo, Hartwig Andreas
Midwestern University, Chicago College of Optometry, Downers Grove, IL, USA.
Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA.
Ophthalmic Physiol Opt. 2017 Sep;37(5):610-623. doi: 10.1111/opo.12402.
Evaluate the importance of orientation of multifocal lens designs with angular increments of addition.
Optical properties of one monofocal and three multifocal designs were analysed with the visual Strehl ratio (VSOTF) metric through-focus (-1 to 5 D). Designs were tested in combination with the higher-order aberrations (HOAs) of 782 subjects (1564 eyes). Simulations included one monofocal, one bifocal (eight orientations), one trifocal (four orientations), and a 4-foci design (four orientations). Monocular and binocular performances of all designs were assessed by computing the area under the through-focus VSOTF plots, the through-focus range of acceptable optical performance, and, for binocular combinations, optical disparity between left and right eyes.
Under monocular conditions, bifocal designs generated larger areas under the through focus VSOTF than trifocal designs and 4-foci designs. Specifically, bifocal designs divided vertically were optimal for 48% of eyes. Trifocal designs and 4-foci designs offered longer intervals of acceptable through-focus vision. Coma and spherical aberration values were correlated with the optimal orientation of multifocal corrections. The best binocular combination was achieved with a monofocal and a trifocal lens. The orientation of a multifocal design with angular areas affected the final optical properties of the combination (lens plus eye).
The optical aberration distributions for our population of physiologically normal eyes demonstrated improved performance for some lens design orientations (i.e., left-right segments for 2-zone bifocals). Taking into account the HOAs of healthy patients, with special attention to coma and spherical aberration, will increase the optical quality of angularly divided multifocal solutions.
评估多焦点镜片设计中附加度数角度增量的取向的重要性。
通过视觉斯特列尔比率（VSOTF）指标，在-1至5D的全焦深范围内分析了一种单焦点和三种多焦点设计的光学特性。将这些设计与782名受试者（1564只眼）的高阶像差（HOA）相结合进行测试。模拟包括一种单焦点、一种双焦点（八种取向）、一种三焦点（四种取向）和一种四焦点设计（四种取向）。通过计算全焦深VSOTF图下的面积、可接受光学性能的全焦深范围，以及对于双眼组合，计算左右眼之间的光学差异，来评估所有设计的单眼和双眼性能。
在单眼条件下，双焦点设计在全焦深VSOTF图下产生的面积比三焦点设计和四焦点设计更大。具体而言，垂直划分的双焦点设计对48%的眼睛是最佳的。三焦点设计和四焦点设计提供了更长的可接受全焦深视力区间。彗差和球差值与多焦点矫正的最佳取向相关。单焦点和三焦点镜片组合获得了最佳的双眼效果。具有角度区域的多焦点设计的取向影响了组合（镜片加眼睛）的最终光学特性。
我们的生理正常眼睛群体的光学像差分布表明，某些镜片设计取向（即两区双焦点的左右部分）的性能有所改善。考虑健康患者的高阶像差，特别关注彗差和球差，将提高角度划分的多焦点解决方案的光学质量。
