Prediction of the Refractive Power after Cataract Surgery on Myopic Eyes

ABSTRACT

After extracapsular cataract extraction and posterior chamber intraocular lens implantation on 62 high myopic patients(79 eyes) whose axial lengths were more than 26.0mm, the authors investigated the differences between the calcualted, predicted, peroperative values and measured postoperative values retrospectively. The patients were divided into 2 groups according to their axial lengths; Group C is 35 patients (44 eyes) with 26.0-28.4mm. Group D is 27 patients(35 eyes) with more than 28.4mm. Group A, as control group, is 70 patients(81 eyes) with 22.0-24.4mm and group B, as control group, is 37 patients(44 eyes) with 24.5-25.9mm. Autorefractive examination and manifest refraction was done at 1week, 1month, 3 months postoperatively. Preoperative intraocular lens diopter was calculated by SRK-II and SRK/T formula. After the scleral incision, continuous circumlinear capsulorhexis, and phacoemulsification, one-piece PMMA lens was implanted in the bag. At postoperative 3 months, all patients had the tendency of myopic shift and the shift calculated by SRK-II was much more than that by SRK/T. The difference was statistically significant. In conclusion, it is better to apply SRK/T formula when axial length is more than 26.0mm, in order to acheive goal diopter postoperatively.