OUTCOMES OF TORIC INTRAOCULAR LENS IMPLANTATION USING SWEPT SOURCE OCT BASED BIOMETER ARGOS AND VERION IMAGE GUIDED SYSTEM

To evaluate the outcomes of patients who underwent cataract surgery with the implantation of a toric intraocular lens (IOL) using corneal measurements obtained with a swept source optical coherence tomography (OCT) based biometer ARGOS and surgical orientation with VERION Image Guided System.

Department of Ophthalmology, Hospital de Santo André - Centro Hospitalar de Leiria, Leiria, Portugal

This retrospective study included 49 eyes of 42 patients who underwent phacoemulsification with implantation of a AcrySof® IQ Toric IOL. IOL power calculation was performed using a swept source OCT based biometer ARGOS and VERION Image Guided System was used for surgical orientation. The main outcome measures were corrected distance visual acuity (CDVA), spherical equivalent refraction and residual astigmatism after a 1 to 3-month follow-up period. Vector differences between preoperative and residual refractive cylinder were calculated using the Alpins vector method including target induced astigmatism (TIA), surgically induced astigmatism (SIA), difference vector (DV) and correction index.

Preoperative mean of cylinder was 2.88±1.36 diopters (D) (vector mean 1.73D @ 76.08º) and it decreased significantly postoperatively to 0.62±0.54 D (vector mean 0.33D @ 67.77º). At last postoperative follow-up, CDVA was 8/10 or higher in 80% of the cases and the cylinder was less than 1D in 74% of the cases. The mean vector of the SIA 0.41D @ 49º was slightly lower than the mean vector of the TIA 0.42D @ 60º and the mean DV was 0.17D @99º. Vector analysis of astigmatism showed a correction index of 0.99.

ARGOS biometer and VERION guidance system promoted good postoperative visual results with an effective and predictable implantation of the toric IOL in patients with corneal astigmatism having cataract surgery.