Comparison of clinical outcomes and vault between two types of posterior phakic intraocular lenses in correction of myopia and myopic astigmatism

Purpose To compare refractive and clinical outcomes of two posterior chamber phakic intraocular lenses (pIOLs) for correction of myopia and myopic astigmatism. To evaluate the vault and its variance for the phakic lenses by anterior segment optical coherence tomography (AS-OCT) and ultrasound biomicroscopy (UBM). Setting Quinze-Vingts National Ophthalmology Hospital, Paris, France. Design retrospective case series Methods Patients received an Implantable Collamer Lens (V5 EVO + ICL, Staar surgical AG, Switzerland) or Intraocular Phakic Contact Lens (V2.0 IPCL Caregroup Sight Solution, India). AS-OCT, optical biometry and corneal topography were performed to measure biometric parameters and evaluate post-operative vault. Results 12 eyes received an ICL and 14 eyes an IPCL. At 12 months postoperatively, the mean UDVAs were 0.06 ± 0.18 logMAR and 0.16 ± 0.23 logMAR in the ICL and IPCL groups, respectively (p = 0.30). No eye lost CDVA in either group. By AS-OCT, the mean vault was 335.33 ± 165.83 μm and 532.64 ± 167.25 μm in the ICL and IPCL groups, respectively (p = 0.006). By UBM, the mean vault was 355.6 ± 136.6 μm and 509.3 ± 180.79 μm in the ICL and IPCL groups, respectively (p = 0.041). Conclusions ICL and IPCL offer similar refractive and clinical outcomes. IPCL tends to display a more consistent vault with less variation from one patient to another.