Calvo-Sanz Jorge A, Sánchez-Tena Miguel A
Instituto de Ciencias Visuales, Madrid, Spain.
Universidad Europea de Madrid, Madrid, Spain.
J Optom. 2020 Jan-Mar;13(1):35-40. doi: 10.1016/j.optom.2018.10.003. Epub 2018 Nov 1.
To characterize the optical performance of two models of refractive bifocal intraocular lenses, with medium and high addition, using defocus curves.
20 eyes from 20 subjects were included in this study. 10 eyes underwent caratact surgery with an implant of a medium addition refractive bifocal intraocular lens (IOL) (Lentis LS-313 MF20) and the other 10 eyes underwent cataract surgery with an implant of a high addition refractive bifocal IOL (Lentis LS-313 MF30). Six weeks after surgery, subjective refraction and defocus curve were made.
Mean final residual refraction in spherical equivalent was +0.10±0.07D in the LS-313MF30 group and +0.12±0.10D in the LS-313MF20 group. Defocus curve showed a different optical performance in intermediate/near distance depending on the IOL model. The medium addition IOL provided good visual acuity (VA) at far and intermediate distance up to 50cms, and the high addition IOL provided better VA in near distance up to 25cms.
The high addition intraocular lens provides better visual acuity in the spatial range from infinity to the point close to 25cm. The medium addition intraocular lens provides excellent visual acuity in far and intermediate vision. The defocus curve seems to be a valid and reproducible tool for evaluating the optical behavior of multifocal sector refractive lenses.
使用散焦曲线来描述两种不同加光量的折射性双焦点人工晶状体的光学性能。
本研究纳入了20名受试者的20只眼睛。10只眼睛接受了植入中等加光量折射性双焦点人工晶状体（IOL）（Lentis LS-313 MF20）的白内障手术，另外10只眼睛接受了植入高加光量折射性双焦点IOL（Lentis LS-313 MF30）的白内障手术。术后六周，进行主观验光和散焦曲线测量。
LS-313MF30组的平均最终等效球镜残余屈光度为+0.10±0.07D，LS-313MF20组为+0.12±0.10D。散焦曲线显示，根据IOL型号的不同，中距离/近距离的光学性能有所差异。中等加光量的IOL在远距和50厘米以内的中距离提供了良好的视力（VA），高加光量的IOL在25厘米以内的近距离提供了更好的VA。
高加光量人工晶状体在从无限远到接近25厘米的空间范围内提供了更好的视力。中等加光量人工晶状体在远视力和中视力方面提供了出色的视力。散焦曲线似乎是评估多焦点扇形折射晶状体光学行为的一种有效且可重复的工具。
