Posterior Chamber Phakic Intraocular Lens Implantaion for Correction of High Myopia

Objective To evaluate the efficacy,safety and stability of the implantation of posterior chamber phakic intraocular lens for correction of high myopia. Methods From January 2011 to March 2013,total 71 eyes of 36 patients with high myopia were underwent posterior chamber phakic intraocular lens implantation and followed up for 6 months in our hospital. The follow-up indexes including uncorrected visual acuity( UCVA),best corrected visual acuity( BCVA),refraction,slitlamp examination,intraocular pressure,Obscan-Ⅱ corneal topography,ultrasound biomicroscopy( UBM),corneal endothelial cells morphometry,were recorded at pre-operation,1 d,1 week,1 month,3 months,6 months after operation,respectively. Meanwhile,the condition of refraction and postoperative complications were observed. Results The preoperative UCVA and BCVA of 71 eyes in 36 patients were 0. 08 ± 0. 02 and 0. 62 ± 0. 29,but the postoperative UCVA and BCVA were 0. 69 ± 0. 30 and 0. 72 ± 0. 28,respectively. The postoperative UCVA was obviously improved,which was equal to preoperative BCVA( P 0. 01). The spherical equivalent refraction was(- 13. 56 ± 4. 25) D and(- 0. 85 ± 0. 36) D at preoperation and the last postoperative follow-up,respectively. The postoperative spherical equivalent refraction of 65 eyes accounted for 91. 5% were within ± 1. 00 D of the targeted refraction. The intraocular pressure and corneal endothelial cells morphometry had no significant difference between preoperation and every postoperative time points( P 0. 05). The anterior chamber depth was significantly decreased from preoperative( 3280 ± 206) μm to postoperative( 2863 ± 217) μm observing by UBM( P 0. 05). The central vault and location of phakic intraocular lens were normal and stable at every following-up time points. Six eyes of four patients occurred high intraocular pressure within one week after operation and recovered to normal through treatment. Two eyes of one patient occurred local anterior subcapsular lens opacities,but the opacities and visual acuity had no development during following-up,so no surgical intervention required. Conclusion The implantation of posterior chamber phakic intraocular lens for correction of high myopia is effective,safe and stable. Accurate preoperative measurement is important for surgical outcomes and helpful for reducing complications.