Postoperative astigmatism and axis stability after implantation of the STAAR toric implantable collamer lens

Abstract

PURPOSE: To evaluate the efficacy, safety, and rotational and footplate stability of the STAAR Toric Implantable Collamer Lens (TICL; STAAR Surgical Co) for correction of myopic astigmatism. METHODS: In this prospective, consecutive, interventional case series, a TICL was implanted uneventfully in 30 consecutive eyes of 20 patients with myopia and astigmatism. The uncorrected visual acuity, best spectacle-corrected visual acuity, refraction, and astigmatism were measured preoperatively and at last follow-up. To evaluate postoperative axis deviation from the intended axis and footplate displacement, a digital anterior segment photograph was taken after full mydriasis and ultrasound biomicroscopy for the four footplates of the TICL in each eye at last follow-up. Possible risk factors for TICL rotation were analyzed through correlation analysis. RESULTS: After mean follow-up of 7.6 months, the mean refractive astigmatism decreased from 2.43±1.24 diopters (D) preoperatively to 0.73±0.47 D postoperatively, and the mean difference between intended and achieved TICL axes was 4.03±3.39°. The absolute value of TICL rotation had significant correlation with the spherical power of the TICL (P=.037). The footplates of all TICLs were in situ in the ciliary sulcus except for one case in which one of the four footplates was located below the ciliary sulcus. CONCLUSIONS: Implantation of the STAAR TICL appears to be an effective and safe method for correction of myopic astigmatism. No clinically significant rotation or footplate displacement of the TICLs was detected postoperatively during mean follow-up of 7.6 months.