Cataract, Age-Related Clinical Trial
Official title:
Comparison of Optical Quality With Different Placement of Refractive Multifocal Intraocular Lens
The study aims to compare postoperative optical quality between two different implanting position of a rotationally asymmetric MIOL [SBL-3 Lenstec; +3.00 diopters (D)], angle kappa based implantation and 0 to 180 degree implantation, in order to find out the optimal implantation position for SBL-3.
SBL-3 has been proved to provide patients with good near, intermediate and distant visual acuity, but there is not much study on the impact of SBL-3 position on postoperative visual acuity.The regional refractive design of SBL-3 means it could be affected by pupil center shift (described by angle kappa: the difference between visual axis and pupil axis), the investigators assume that maintaining the ideal ratio of distant and near segment(50% vs 42%) in the pupil center could yield both good distant and near postoperative visual acuity postoperatively. Therefore, the investigators designed the implantation by placing the IOL based on angle kappa to make sure the ratio of distant and near segment exposure in the pupil center close to 50:42. In this study, the investigators assessed the optical quality in patients with SBL-3 implantation based on angle kappa and 0 to 180 degree to provide surgeons with information for choosing appropriate implantation position for optimum postoperative satisfaction of SBL-3. ;