Contribution of 3D anterior segment reconstruction by rotative UBM to the sizing of phakic IOL

Purpose Posterior phakic implantation is the recommended procedure for high ametropia correction but it is harmed by a difficult sizing inducing errors. We designed a 3D rotative UBM prototype in order to take into account the volume of the posterior chamber to improve the sizing. Methods 7 myopic eyes (mean MRSE: -10.8) of 4 patients underwent a phakic implantation by one surgeon with a “white to white”-based sizing method. During the 3rd postoperative month, we evaluated several mesures that we assessed by anterior segment OCT (2D) and by our UBM prototype (3D), designed by the LaTIM -Inserm U1101 in association with Quantel Medical®. It contains a linear scanning probe of 50 MHz with a rotative motor (acquisition of 30 coaxial slides). Results 3D reconstruction gives us a representation of one eye on 360°. For each eye, we have compared data pre and postoperative implantation and our results reflect the conventional impact of implant. Conclusion Our rotative probe has allowed the first 3D reconstruction of the ocular anterior segment. This initial approach reports high anatomical variations and non uniformity of intraocular clearances, explaining potentially some unexpected IOL positioning. Our goal is to have an accurate visualization of relationship between phakic IOLs and intraocular surrounding structures. Perspectives could be the evaluation of the impact of accommodation on intraocular volumes in addition to preoperative simulations in 3 dimensions. Commercial interest