Percival P
Department of Ophthalmology, Scarborough Hospital, UK.
Doc Ophthalmol. 1992;81(3):285-92. doi: 10.1007/BF00161766.
The performance of multifocals is partly determined by the degree to which contrast at the focussed image is reduced by out of focus images. This paper discusses how optical performance may vary with lens design and includes consideration, with available core study results, of multifocal designs marketed by Iolab, 3M, AMO, Ioptex, Storz and Domilens. For most lenses an acuity of 20/40 and J3 can be achieved unaided in over 70% of best case eyes and J2 with the distance correction in over 80%. However the risk of disappointment tends to prevent a more widespread use of multifocals among surgeons, and an explanation is given as to possible reasons.
多焦点人工晶状体的性能部分取决于聚焦图像的对比度因失焦图像而降低的程度。本文讨论了光学性能如何随镜片设计而变化，并结合现有核心研究结果，对Iolab、3M、AMO、Ioptex、Storz和Domilens销售的多焦点设计进行了考量。对于大多数镜片，在超过70%的最佳情况眼中，无需辅助即可达到20/40的视力和J3的视力，在超过80%的眼中，加上远距矫正可达到J2的视力。然而，令人失望的风险往往阻碍了多焦点人工晶状体在外科医生中更广泛的使用，并对可能的原因给出了解释。
