Refractive outcome of trocar-assisted sutureless scleral fixation with 3-piece intraocular lenses

Purpose Intraocular lens (IOL) implantation with a trocar-assisted sutureless scleral fixation technique is a relatively new IOL implantation approach for aphakic eyes. During this surgery, the intrascleral position of the haptics can change the location of the IOL optic and may alter the refractive outcome. This study aimed to evaluate the refractive outcome of this surgery. Methods The files of 22 patients who had undergone IOL implantation with the trocar-assisted sutureless scleral fixation technique were retrospectively reviewed, and the patients were invited for final examination. IOL power was calculated with optical biometry (Lenstar LS900). IOL power calculations were performed according to formulas designed for in-the-bag IOL implantation. The final refractive error was determined with an autorefractometer (Topcon KR-1/RM-1). Results This study included 14 patients (8 male, 6 female, mean age: 62.7 +/- 18.7). There were no significant differences between the preoperative and postoperative corneal astigmatism values (p = 0.16). There were also no significant differences between the postoperative corneal and total astigmatism values (p = 0.44), confirming the absence of significant IOL tilt. The difference between the implanted IOLs and the calculated IOL power for emmetropia was 0.09 D +/- 0.49 D (p = 0.52). Although emmetropia was targeted, the refractive outcome shifted to hyperopia (+ 0.85 D +/- 1.15 D) and was significantly different from the refractive status calculated with optical biometry (p = 0.034). Conclusions The intrascleral fixation of IOLs results in increased posterior positioning of the IOL optic and can induce approximately 0.85 D of hyperopia if proper adjustments are not performed during IOL power calculations.