Winther-Nielsen A, Corydon L, Olsen T
Department of Ophthalmology, Vejle Sygehus, Denmark.
J Cataract Refract Surg. 1993 Mar;19(2):254-7. doi: 10.1016/s0886-3350(13)80952-2.
Contrast sensitivity was measured in 25 patients who had a multifocal diffractive intraocular lens and in 23 control patients with a monofocal lens in four simulated light conditions: (1) daylight, (2) daylight with peripheral glare, (3) twilight, (4) twilight with central glare. In normal daylight and twilight, contrast sensitivity of the multifocal group was significantly lower than the control group's (P < .05). The difference was 0.13 log units for the multifocal group and 0.17 log units for the control group (mean value across the tested frequency from 1.5 to 18 cycles/deg). Peripheral glare reduced contrast sensitivity under daylight conditions in both groups (P < .05), but the loss did not differ significantly between the two (P > .05). Central glare reduced contrast sensitivity under twilight conditions in both groups (P < .05), with the greatest loss in the multifocal patients (P < .001). We conclude that the most significant loss of contrast sensitivity in patients with the diffractive multifocal intraocular lens is found with central glare under twilight conditions.
在四种模拟光照条件下，对25例植入多焦点衍射型人工晶状体的患者和23例植入单焦点晶状体的对照患者进行了对比敏感度测量：（1）日光；（2）伴有周边眩光的日光；（3）黄昏；（4）伴有中央眩光的黄昏。在正常日光和黄昏条件下，多焦点组的对比敏感度显著低于对照组（P <.05）。多焦点组的差异为0.13对数单位，对照组为0.17对数单位（测试频率范围为1.5至18周/度的平均值）。周边眩光在日光条件下降低了两组的对比敏感度（P <.05），但两组之间的损失无显著差异（P >.05）。中央眩光在黄昏条件下降低了两组的对比敏感度（P <.05），多焦点患者的损失最大（P <.001）。我们得出结论，在黄昏条件下，中央眩光会导致衍射型多焦点人工晶状体患者的对比敏感度损失最为显著。
