Pieh S, Weghaupt H, Skorpik C
University Eye Clinic Vienna, Wien, Austria.
J Cataract Refract Surg. 1998 May;24(5):659-62. doi: 10.1016/s0886-3350(98)80261-7.
To compare contrast sensitivity and glare disability provided by diffractive and refractive multifocal intraocular lenses (IOLs).
University Eye Clinic Vienna, Austria.
This study evaluated the contrast sensitivity and glare disability in 29 eyes with a diffractive multifocal IOL (3M815LE) and 12 with a three-piece, five-zone refractive multifocal IOL (AMO Array SSM 26 NB). The Brightness Acuity Tester (Mentor, Inc.) was used with stationary sinusoidal gratings at spatial frequencies of 0.5, 1, 3, 6, 11.4, and 22.8 cycles per degree (cpd) generated on a television monitor (Nicolet CS 2000).
The contrast sensitivity functions of both multifocal IOL groups were within the reference range and were identical at 0.5, 1, and 22.8 cpd spatial frequencies. At 3, 6, and 11.4 cpd, the contrast sensitivity function in the diffractive IOL group was 6, 9, and 10% lower than in the refractive IOL group, and the difference between groups was statistically significant at 6 cpd. When glare was present, contrast sensitivity in the diffractive IOL group was generally in the lower limit of the reference range and remained below at 3 and 6 cpd. Contrast sensitivity in the refractive IOL group remained below the reference range at 3 cpd. At 0.5 and 1 cpd, there were no differences between the groups. At the middle and high spatial frequencies (3, 6, 11.4, 22.8 cpd), contrast sensitivity in the diffractive group was 8, 16, 11, and 12% lower than in the refractive group. At 6 cpd, the between-group difference was statistically significant.
Diffractive multifocal IOLs provided decreased contrast sensitivity and greater glare disability than refractive multifocal IOLs.
比较衍射型和折射型多焦点人工晶状体（IOL）的对比敏感度和眩光失能情况。
奥地利维也纳大学眼科诊所。
本研究评估了29只植入衍射型多焦点IOL（3M815LE）的眼睛和12只植入三片式、五区折射型多焦点IOL（AMO Array SSM 26 NB）的眼睛的对比敏感度和眩光失能情况。使用亮度视力测试仪（Mentor公司），在电视监视器（Nicolet CS 2000）上生成空间频率为每度0.5、1、3、6、11.4和22.8周/度（cpd）的静止正弦光栅。
两个多焦点IOL组的对比敏感度函数均在参考范围内，且在0.5、1和22.8 cpd空间频率下相同。在3、6和11.4 cpd时，衍射型IOL组的对比敏感度函数比折射型IOL组低6%、9%和10%，两组之间的差异在6 cpd时具有统计学意义。当存在眩光时，衍射型IOL组的对比敏感度通常处于参考范围的下限，在3和6 cpd时仍低于该范围。折射型IOL组在3 cpd时的对比敏感度仍低于参考范围。在0.5和1 cpd时，两组之间没有差异。在中高空间频率（3、6、11.4、22.8 cpd）下，衍射型组的对比敏感度比折射型组低8%、16%、11%和12%。在6 cpd时，组间差异具有统计学意义。
与折射型多焦点IOL相比，衍射型多焦点IOL的对比敏感度降低，眩光失能更严重。
