Evaluation of the Anterior Chamber Parameters by Pentacam after Toric Implantable Phakic Contact lens (IPCL) Implantation in Moderate to High Myopia with Astigmatism

Abstract

Background: The toric IPCL is posterior phakic intraocular lens used for correction of moderate to high myopia with astigmatism, but after the implantation, there were changes in the parameters of the anterior chamber (AC). Purpose: The purpose of this study is to assess the parameters of the AC and lens vault after toric IPCL in patients with moderate to high myopia with astigmatism by Pentacam. Patients and Methods: In a prospective interventional case series, 30 eyes with moderate to high myopia with astigmatism were treated with toric IPCL implantation. Pentacam was done preoperatively, after 1 month, 3 months and 6 months of toric IPCL implantation for evaluation of the AC parameters as the angle of the anterior chamber (ACA), depth of the anterior chamber (ACD) and volume of the anterior chamber (ACV). Also, the lens vault and intraocular pressure (IOP) were evaluated. Results: The ACD was 3.3±0.1 mm preoperatively and changed to 2.5±0.1 mm after 1 month and remained stable at 3 and 6 months postoperatively (p-value =0.001). The ACV was 198.06±25.02 mm3 preoperatively and reduced to 131.5±20.7, 131.8±21.4 and 131.5±20.2 mm3 after 1 month, 3 months and 6 months, respectively(p-value =0.001). The ACA was 42.9±4.1 preoperatively and changed to 26.7±4.3, 26.4±4.2 and 26.7±4.9 after 1 month, 3 months and 6 months, respectively (p-value =0.001). The vault was 458±126.2 um after 1 month, 461±129.6 um after 3 months and 464.6±130.6 um after 6 months (p-value =0.005). The IOP was slightly high during the first month, then reduced to a level near the preoperative values during the second and third follow-up. Conclusion: The Pentacam was a useful tool for follow up of the AC parameters after toric IPCL implantation in patients with moderate to high myopia astigmatism.