渐进多焦点镜片——测量与评级

Progressive addition lenses--measurements and ratings.

作者信息

Sheedy Jim, Hardy Raymond F, Hayes John R

机构信息

The Ohio State University, College of Optometry, Columbus, Ohio 43210, USA.

出版信息

Optometry. 2006 Jan;77(1):23-39. doi: 10.1016/j.optm.2005.10.019.

DOI:10.1016/j.optm.2005.10.019

PMID:16458243

Abstract

BACKGROUND

This study is a followup to a previous study in which the optics of several progressive addition lens (PALs) designs were measured and analyzed. The objective was to provide information about various PAL designs to enable eye care practitioners to select designs based on the particular viewing requirements of the patient.

METHODS

The optical properties of 12 lenses of the same power for each of 23 different PAL designs were measured with a Rotlex Class Plus lens analyzer. Lenses were ordered through optical laboratories and specified to be plano with a +2.00 diopters add. Measurements were normalized to plano at the manufacturer-assigned location for the distance power to eliminate laboratory tolerance errors. The magnitude of unwanted astigmatism and the widths and areas of the distance, intermediate, and near viewing zones were calculated from the measured data according to the same criteria used in a previous study.

RESULTS

The optical characteristics of the different PAL designs were significantly different from one another. The differences were significant in terms of the sizes and widths of the viewing zones, the amount of unwanted astigmatism, and the minimum fitting height. Ratings of the distance, intermediate, and near viewing areas were calculated for each PAL design based on the widths and sizes of those zones. Ratings for unwanted astigmatism and recommended minimum fitting heights were also determined. Ratings based on combinations of viewing zone ratings are also reported.

CONCLUSIONS

The ratings are intended to be used to select a PAL design that matches the particular visual needs of the patient and to evaluate the success and performance of currently worn PALs. Reasoning and task analyses suggest that these differences can be used to select a PAL design to meet the individual visual needs of the patient; clinical trials studies are required to test this hypothesis.

摘要

背景

本研究是对先前一项研究的后续跟进，在先前研究中对几种渐进多焦点镜片（PALs）设计的光学特性进行了测量和分析。目的是提供有关各种PAL设计的信息，以使眼保健从业者能够根据患者的特定视觉需求选择设计。

方法

使用Rotlex Class Plus镜片分析仪测量了23种不同PAL设计中每种设计的12片相同屈光度镜片的光学特性。镜片通过光学实验室订购，并指定为平光，附加度数为+2.00屈光度。测量值在制造商指定的远用屈光度位置归一化为平光，以消除实验室公差误差。根据先前研究中使用的相同标准，从测量数据中计算出不需要的散光量以及远、中、近视觉区的宽度和面积。