Posterior Chamber Phakic IOL Implantation in High Myopia: Clinical and Ultrasound Biomicroscopy Study
Purpose
To report post phakic ICL implantation changes in high myopia. Clinical findings, visual and refractive results are reported. The changes of anterior chamber and chamber angle structures after (ICL) implantation were evaluated by using ultrasound biomicroscopy (UBM).
Methods
A prospective series case study was conducted on 15 high myopia patients (30 eyes) treated with ICL implant. These patients were followed for one year postoperatively. CORNEA, AC depth, pupils, patency of irdectomies, lens clarity and any pigment depositions were documentedAll eyes were examined by UBM one year after the surgery. Central anterior chamber depth (ACD), trabecular-iris angle (TIA), the distance between the posterior surface of ICL and the lens (VAULT) and the distance between peripheral surface of ICL and the lens were measured. Nonparametric test was used to compare TIA. One-way ANOVA was used to assess the distance between peripheral surface of ICL and the lens. Repeated Measure ANOVA and Bonferroni test was performed to compare the IOP level before and after surgery. Paired t-test was used to compare ACD.
Results
A prospective series case study was conducted on 15 high myopia patients (30 eyes) treated with ICL implant. These patients were followed for one year postoperatively. CORNEA, AC depth, pupils, patency of irdectomies, lens clarity and IOP were documented All eyes were examined by UBM one year after the surgery. Central anterior chamber depth (ACD), trabecular-iris angle (TIA), the distance between the posterior surface of ICL and the lens (VAULT) and the distance between peripheral surface of ICL and the lens were measured. Nonparametric test was used to compare TIA. One-way ANOVA was used to assess the distance between peripheral surface of ICL and the lens. Repeated Measure ANOVA and Bonferroni test was performed to compare the IOP level before and after surgery. Paired t-test was used to compare ACD.
Conclusion
Posterior chamber phakic intraocular lens implantation for the surgical correction of high myopia is a safe procedure as evaluated with immediate visual and refractive results. We found that the iridocorneal angle and the anterior chamber depth are decreased after the surgery. There is no contact between the crystalline lens and ICL. The ICL contacts with the posterior iris surface.