Refractive outcomes of scleral-sutured posterior chamber intraocular lenses in post-traumatic eyes

Purpose To evaluate the refractive outcomes of scleral-sutured IOL 2 mm posterior to the limbus in post-traumatic eyes using SRK/T formula. Methods This single-center retrospective case series included 35 eyes from 35 post-traumatic patients undergoing scleral-suture of ErgomaX IOLs by a single experienced surgeon. Preoperative predicted refraction, procedure-related complications, and postoperative spherical equivalent (SE) at least 1 month after surgery were recorded. The prediction error (PE) was calculated as the difference between the postoperative SE and preoperative predicted refraction. Results Of the 35 post-traumatic patients, 28 patients were aphakia without capsular support, and 7 patients were traumatic lens dislocation or subluxation. The mean age at surgery was 56.03 +/- 14.56 years and 28 patients were men (80%). The mean postoperative spherical equivalent (SE) and postoperative astigmatism were - 1.23 +/- 0.82 D and 1.57 +/- 1.14 D, respectively. The mean prediction error (ME) of SRK/T formula was - 0.17 D. The mean absolute error (MAE) was 0.48D. The prediction accuracy was 60.0% for refractive errors of +/- 0.50 D and 85.7% for refractive errors of +/- 1.00D. Multiple linear regression analyses revealed that IOL power has positive correlation with PE. Conclusion Assumption of in-the-bag IOL position when calculating IOL (52501TY, ErgomaX) power for standardizing scleral-sutured IOL 2 mm posterior to the limbus demonstrates acceptable refractive outcomes. The accuracy of IOL power calculation using the SRK/T formula for eyes needing low IOL power or high IOL power may be affected by the uncertain position of postoperative IOL and further studies are needed.