Long-term observation on safety and visual quality of implantable collamer lens V4c implantation for myopia correction:a 5-year follow-up

AIM:To elucidate the safety and visual quality of implantable collamer lens with central hole(ICL V4c)implantation for correcting moderate and high myopia for at least 5y.METHODS:This retrospective study was conducted on 58 patients(114 eyes)who were followed up for at least 5y after ICL V4c implantation.The observation was done before and on 1d,1mo,1 and 5y or more after the surgical procedure.The visual acuity,subjective refraction,intraocular pressure,vault,axial length,central hole position,pupil diameter,visual quality,and adverse events were analyzed.The visual quality includes aberration,the modulation transfer function cutoff frequency(MTF cutoff),objective scattering index(OSI),Stroller's ratio(SR),and visual quality questionnaire.RESULTS:The average follow-up period was 69.25±3.80mo(range 60–82mo)and the preoperative spherical equivalent(SE)was-8.66±1.97 D.At 5y after operation,the safety index was 1.01±0.02 and the efficacy index was 0.99±0.42 and SE was-0.65±0.63 D.The 59.6%of the eyes achieved an uncorrected distance visual acuity of 20/20,76.3%of the eyes had SE within±1.0 D at the last visit.The axial length increased by 0.29±0.71 mm 5y after the surgery(t=-3.843,P<0.001).The mean vault at the last follow-up was 510.59±245.61μm.The central hole was on the temporal side in 80 eyes(84.2%).The visual quality questionnaire showed that 98.2%patients were satisfied with the surgical procedure.Adverse events occurred in 4 eyes(3.5%),including the posttraumatic toric ICL rotation(2 eyes),iris incarceration(1 eye),and posttraumatic ICL displacement(1 eye)at the last follow-up.CONCLUSION:Long-term ICL V4c implantation is safe,effective,and stable for correcting moderate and to high myopia,and the visual quality with patients is excellent and satisfactory,but the progression of axial length still needs attention after surgery.

角膜厚度测量的研究进展

中央角膜厚度对角膜疾病、青光眼、角膜屈光手术等眼部疾病和手术有重要影响,获得精准的角膜中央厚度为临床医师提出了更高的要求,也是大家一直非常关注的话题。目前,临床中常用的角膜厚度测量仪器有2类原理:第一类为超声波测量,例如传统的A型超声角膜测厚仪(A超)、超声生物显微镜(UBM);第二类是光学测量原理,包括Pentacam眼前节分析仪、角膜内皮镜、光学相干断层扫描仪(OCT)、Lenstar LS900光学生物测量仪。不同的测量方法和相应仪器都具有各自的优点及不足。角膜厚度测量最佳的发展方向应为简单易用、重复性好、准确性高。因此对目前临床常用的角膜厚度测量仪器的原理及特点进行综述,总结当下角膜测厚的研究进展,为临床眼科医生提供理论依据和临床指导。