​​Influence Of Capsulorhexis Morphology On Rotational Stability Of Toric Intraocular Lens Implantation

To evaluate the rotational stability in patients who underwent phacoemulsification and intraocular lens implantation with the enVista Toric MX60T (Bausch & Lomb, Laval, Canada) lens, and its relationship with the capsulorhexis morphology and different ocular biometrics.

Terciary care center.

We included 59 eyes of 59 patients with cataract and regular corneal astigmatism who underwent uncomplicated phacoemulsification with enVista Toric MX60T intraocular lens implantation. Measurements of ocular biometry, including axial length, anterior chamber depth, lens thickness, and white-to-white were performed with the IOLMaster 700 (Carl Zeiss, Oberkochen, Germany). Capsulorhexis morphology characteristics, including perimeter, area, horizontal and vertical diameter, and circularity index were taken with the ImageJ program through clinical photographs under pupillary dilation at 24 hours post-surgery. OPD-Scan III was performed post-op at 24 hours and at 1 month to quantify lens rotation.

At 1-month post-op, mean refractive cylinder was of 0.1 ± 0.61 diopters, and mean lens rotation was of 5.00 ± 3.93 degrees. 52 % of lens rotated 5° or less. Post-surgical uncorrected visual acuity was 20/30 or better in 64 % of eyes. Multivariate logistical regression analysis showed there were no statistically significant correlations between lens rotation, capsulorhexis morphology, and the different ocular biometric parameters at 24 hours and 1-month post-op.

The magnitude of rotation of the enVista Toric MX60T intraocular lens is not related to the capsulorhexis morphology or ocular preoperative biometrics. Further research is needed to assess variables that may affect toric intraocular lens rotation, to improve post-surgical visual and refractive outcomes.