Optometry Research Group, Optics Department, Faculty of Physics, University of Valencia, c/ Dr. Moliner, 50, 46100 Burjassot, Valencia, Spain.
Optometry Research Group, Optics Department, Faculty of Physics, University of Valencia, c/ Dr. Moliner, 50, 46100 Burjassot, Valencia, Spain.
Cont Lens Anterior Eye. 2014 Jun;37(3):162-7. doi: 10.1016/j.clae.2013.09.014. Epub 2013 Oct 21.
To evaluate the power profile of multifocal contact lenses (CLs) using a new technology based on quantitative deflectometry.
The Nimo TR1504 was used to analyze the power distribution of multifocal CLs. The CLs under study were: Air Optix Aqua Multifocal Low, Medium and High Addition and Focus Progressives. Three lenses of each model were considered.
All multifocal CLs showed a power profile characterized by a change toward more positive power values when aperture sizes become smaller. The near refractive addition of the lenses under study was +2.61 D, +1.44 D, +1.30 D and +0.30 D for the Focus Progressives, the Air Optix Aqua Multifocal High, Medium Add and Low Add, respectively. The refractive power of the Focus Progressives did not reach the value of the nominal distance power until a radial distance of 0.9 mm from the center of the lens. For the Air Optix Aqua Multifocal Low Add the distance nominal power was reached at a radial distance of 1.5mm from the center of the lens, whereas this occurred at a distance of 1.8mm for the Air Optix Aqua Multifocal Medium and High Add.
The relation between the pupil diameter of the patients and the power profile of these CLs has a crucial implication on the final distance correction and near addition that these lenses provide to patients. Practitioners should know the power profile of these CLs and measure the pupil diameter of each patient in different situations in order to carry out a customized fitting.
利用基于定量偏折术的新技术评估多焦点接触镜（CL）的功率分布。
使用 Nimo TR1504 分析多焦点 CL 的功率分布。研究中的 CL 为：Air Optix Aqua Multifocal Low、Medium 和 High Add 以及 Focus Progressives。每种型号考虑三个镜片。
所有多焦点 CL 的功率分布特征均为，当孔径尺寸变小时，向更正的功率值变化。研究中的镜片的近视力附加度数分别为 Focus Progressives 的+2.61 D、+1.44 D、+1.30 D 和+0.30 D，Air Optix Aqua Multifocal High、Medium Add 和 Low Add。直到距镜片中心 0.9mm 的径向距离，Focus Progressives 的折射力才达到标称距离力的值。对于 Air Optix Aqua Multifocal Low Add，距离标称力在距镜片中心 1.5mm 的径向距离达到，而对于 Air Optix Aqua Multifocal Medium 和 High Add，则在距镜片中心 1.8mm 的距离达到。
患者瞳孔直径与这些 CL 的功率分布之间的关系对这些镜片最终提供给患者的距离矫正和近附加有重要影响。从业者应该了解这些 CL 的功率分布，并在不同情况下测量每个患者的瞳孔直径，以进行定制拟合。
