Long-Term Rotational Stability Of A Single-Piece Hydrophobic Acrylic Toric Iol; Visual Outcomes In Relation To Corneal Change Over Time: A 3 Years Follow-Up

To evaluate the rotational stability and visual outcomes of a single-piece hydrophobic acrylic toric intraocular lens (IOL) over a 3 year follow-up period.

Two hundred and twelve eyes of 148 cataract patients (mean age: 74.3±9.5y) with pre-existing corneal astigmatism of 1.1 to 5.2 D were enrolled in the study. Mean axial length was 24.13±1.68 mm. Main outcome measures after implantation of the Toric IOL (Alcon) were uncorrected and best corrected distance visual acuity (UCVA, BCVA), subjective refraction, astigmatism correction and IOL rotational stability. For the IOL power calculation, the axial length and curvature of corneal anterior surface were measured using the IOL Master 700 (Carl Zeiss). Total keratometric power, Kmin and Kmax were measured using the corneal tomographer Sirius (CSO). The surgically induced astigmatism of 0.20 D was used for IOL power calculation.

There was no significant change in the parameters evaluated between the 1-month and 3-years follow- ups. At last visit, mean absolute IOL rotation (through the function available in the Osiris Aberrometer - CSO) was 2°±1.91° (range 0.00° to 6.50°) with 77% of eyes having IOL rotation <2°, 92% of eyes <5° and 100% of eyes <7°. Mean residual refractive cylinder was - 0.26±0.53 D. There was a significant reduction in the magnitude of the J0 vector postoperatively with a mean absolute change of 0.76±0.40 D. The mean J45 vector was close to zero preoperatively and postoperatively and didn’t change significantly. Mean monocular UCVA and BDVA was 0.09±0.17 logMAR and 0.02±0.08 logMAR, respectively.Nd:YAG laser was required in 15% of the eyes.