Myopic shift of sulcus suture-fixated posterior chamber intraocular lenses

Abstract

PurposeThe objective of this study is to evaluate the myopic shift in sulcus suture-fixated posterior chamber intraocular lenses (PC IOLs). MethodsIt was a retrospective study of patients diagnosed with lens subluxation or aphakia who received sulcus suture-fixated PC IOLs from 2004 to 2010. Preoperative visual acuity; axial length; predicted IOL power by the SRK-T, Hoffer-Q, and Holladay-1 formulas; predicted refraction; postoperative visual acuity; and postoperative refraction were recorded. Differences between postoperative refraction and predicted refraction for an in-the-bag lens were calculated for each patient. ResultsTwenty eyes from 16 patients with sulcus suture-fixated PC IOLs were included in the study. Another 18 eyes from 18 patients with in-the-bag fixation of IOL were assigned to the control group. In a study group, the difference between postoperative spherical equivalent and predicted refraction was −1.66 ± 0.97 D. The simple linear regression suggests that the SRK-T formula provides a better calculation of IOL power than other formulas for sulcus suture fixation of PC IOL using our technique. A comparison of postoperative refraction shifts between the study and the control groups showed that the myopic shift was statistically significant in the study group (p < 0.001). ConclusionSulcus suture-fixation of a PC IOL induces, on average, a 1.66 D myopic shift, which is equivalent to an IOL power of around 2 D. In order to prevent a postoperative hyperopia refraction, we suggest that IOL power should be reduced to 1–1.5 D for performing sulcus fixation using our technique.