ICL Implatation For The Correction Of Extreme Myopia

PURPOSETo evaluate the efficacy, safety and stability of implantable contact lens (ICL) implantation for the correction of extreme myopia. METHODSThis prospective study included 137 eyes of 71 patients with a mean age of 31 years (18～44) from January 2004 to 2006.An implantable contact lens version 4(ICL V4,Staar Surgical Inc.) was inserted. Patients were prospectively followed preoperatively and at 1 day,l week,1,3,6,12 and 24 months include the unconnected visual acuity(UCVA) and best corrected visual acuity(BCVA), slitlamp examining, refraction,intraocular pressure and so on. The mean preoperative spherical equivalent is 18.24 ± 4.05D (-8.625D～-35.125D) diopters .Surgical implantation was performedthrough a 3mm clear corneal sutureless incision using paraocular anesthesia. The meanfollow-up was 19.6 months(range 6 to 24 months).RESULTSSuccessful implantation was achieved in all patients.Postoperatively,all eyes had a significant increase in uncorrected visual acuity.The mean spherical equivalent refraction at the last examination was -1.16D± 1. 49 (SD ) (+0.625D～-7.00D ) ,within ± 1.00D of the targeted refraction in 123 eyes (89.8%) and within ± 0.50D in 104 eyes(75.9%).In eyes in which the preoperative myopia was less than 20.00D (n=93),the achieved refraction was within ± 1.00D of the intended refraction in 91 eyes (97.8%) and within ± 0.50D in 80 eyes (86.0%).The refraction remained stable with a statistically insignificant change (P>0.05) at each interval during the follow-up.The best corrected visual acuity (BCVA) improved by 1 or more lines in 110 eyes (80.3%) at 1 year.1 eyes (0.730%) lost 1 line of BCVA.No pupillary block glaucoma and cataract requiring surgical intervention occurred during the follow-up. CONCLUSIONPosterior chamber phakic intraocular lens implantation appears to be a efficacy, safety and stability method for the correction of extreme myopia.