Bell G R
Optometry. 2001 Apr;72(4):239-46.
Despite the fact that more than 50% of multifocal lenses dispensed in the United States are progressive addition lenses, adequate methods for clinical verification of these lenses have been lacking. Using automated lens meter techniques, the author describes a simplified method for verification of these complex lenses.
Thirty pairs of progressive lenses were measured in a modified method using a Humphrey 330 Lens Analyzer. Fifteen pairs were "premium-quality" progressive lenses: fifteen pairs were "non-premium-quality" progressives. Five criteria were assessed on each lens: Distance Zone Width (DZW). Intermediate Zone Width (IZW), Near Zone Width (NZW), Drop Distance (DD), and Maximum Astigmatic Distortion (MAD).
"Premium-quality" progressive lenses failed to demonstrate clear-cut superiority over "non-premium-quality" progressive lenses in the five specified criteria. Individual measurements indicate considerable product inconsistency affected every brand tested.
Premium- and non-premium-quality progressive lenses demonstrated similar performance characteristics in this study. Zone size variation in these lenses was found to be considerable, a characteristic that seemed to cut across brand lines. The AO Compact lens seemed to demonstrate a shorter drop distance than other lenses, which does enhance its suitability for use with small frames. A comparison of the Essilor Natural PAL to the Younger Image lens showed little difference in the categories measured, although peripheral distortions seemed closer to the reading zone in the image. A comparison of the MAD of lenses in this study to lenses tested in 1986 indicates a considerable improvement has been made in that important characteristic.
尽管在美国所配的多焦点镜片中有超过50%是渐进多焦点镜片，但一直缺乏对这些镜片进行临床验证的适当方法。作者利用自动镜片测度仪技术，描述了一种验证这些复杂镜片的简化方法。
使用汉弗莱330镜片分析仪，以改良方法对30副渐进镜片进行测量。其中15副是“优质”渐进镜片，15副是“非优质”渐进镜片。对每副镜片评估五项标准：远用区宽度（DZW）、中间区宽度（IZW）、近用区宽度（NZW）、下降距离（DD）和最大散光畸变（MAD）。
在五项特定标准中，“优质”渐进镜片并未显示出比“非优质”渐进镜片有明显优势。个别测量结果表明，产品一致性差异很大，影响了所测试的每个品牌。
在本研究中，优质和非优质渐进镜片表现出相似的性能特征。发现这些镜片的区域大小差异相当大，这一特征似乎不受品牌界限的影响。AO紧凑型镜片的下降距离似乎比其他镜片短，这确实提高了其与小镜框配合使用的适用性。依视路自然渐进多焦点镜片与杨氏影像镜片的比较显示，在所测量的类别中差异不大，尽管影像镜片的周边畸变似乎更靠近阅读区。本研究中镜片的最大散光畸变与1986年测试的镜片相比，表明在这一重要特性方面有了相当大的改进。
