Preliminary results of a IPCL phakic lens vault pilot study under different lighting conditions

Abstract

Objective: To evaluate a posterior chamber phakic lens vault and its possible changes under different lighting conditions.
Materials and methods: A prospective case-series study was performed on 44 eyes (22 patients) operated with a phakic lens IPCL V2.0, between January and December of 2018, under three different lighting conditions (mesopic/scotopic/photopic). The central vault was measured with an optic coherence tomograph. The results obtained one and 2 years after surgery were compared, and the differences between the scotopic and the photopic condition was evaluated. Demographic aspects were also evaluated, as well as lens characteristics, endothelial cell density and central corneal thickness, as well as cataracts development.
Results: The mean age was 37 ± 9.7 years old; preoperative spherical equivalent: -8.4 ± 3.5 D; anterior chamber depth: 3.46 ± 0.28 mm; optic power: -8.9 ± 3.4 D. Endothelial cell density and central corneal thickness decreased 72.6 cells/mm² (p=0.15) and 0.5 mm (p=0.86), respectively. Two years after surgery, vault values were 582.6 ± 192.4 µm (mesopic); 635.3 ± 240.5 µm (scotopic) and 536.9 ± 216 µm (photopic), with no statistically significant changes when compared to results obtained one year after surgery (p=0.27, 0.72, 0.92, respectively). The vault difference observed between the scotopic and the photopic condition was 98.4 ± 48.4 µm (p=0.001). Two years after surgery, no cataracts were detected.
Conclusions: The IPCL V2.0 phakic lens vault remained stable 2 years after surgery. Statistically significant differences were found when comparing the scotopic and the photopic lighting conditions. Cataracts, however, were not detected.