Accuracy of IOL Power Calculation Using the New Carlevale Sutureless Scleral Fixation Posterior Chamber IOL

Abstract

Purpose: To evaluate the refractive outcomes of the new Carlevale foldable sutureless scleral fixation intraocular lens (SSF-IOL) (Soleko in eyes without capsular support.

Methods: This retrospective, single-center, noncomparative interventional case series included 25 consecutive eyes of 25 consecutive patients with either aphakia or lens/IOL dislocation due to capsular or zonular defects. The Hoffer Q, Holladay 1, and SRK/T formulas, which do not need measurements of the anterior chamber depth to predict the IOL position, were used to calculate the IOL power. Constant optimization was performed to zero out the mean prediction error (PE). The main outcome measures were mean PE ± standard deviation, median absolute error (MedAE), mean absolute error (MAE), and percentage of eyes with a PE within ±0.50 and ±1.00 diopters (D).

Results: Mean axial length was 24.09 ± 2.09 mm (range: 21.85 to 32.17 mm). No statistically significant differences were found among the three formulas for any parameter. The PE was zero due to constant optimization and its standard deviation ranged between 0.89 and 0.95 D. The MedAE ranged between 0.30 and 0.34 D, whereas the MAE ranged between 0.62 and 0.67 D. The percentage of eyes with a PE within ±0.50 D was between 56% and 64% and the percentage of eyes with a PE within ±1.00 D was between 69% and 72%.

Conclusions: Reasonably good refractive outcomes can be obtained when implanting SSF-IOLs in eyes with no capsular support, although the accuracy is lower than what is reported for normal in-the-bag IOL implantation. [J Refract Surg. 2021;37(7):472-476.].