Comparison of anterior section parameters using anterior segment optical coherence tomography and ultrasound biomicroscopy in myopic patients after ICL implantation

AIM：To compare the agreement of anterior chamber depth（ACD）and central vault measurements obtained by anterior segment optical coherence tomography（AS-OCT）and ultrasound biomicroscopy（UBM）of post surgical high myopic eyes with posterior chamber phakic intraocular lens（Visian ICL;STAAR Surgical）implantation.·METHODS：Fifty-two phakic eyes of 28 high myopic patients who underwent implantable Collamer lens（ICL）surgery for the correction of high myopia were studied.The postoperative ACD,the distance between the corneal endothelium and the anterior surface of ICL（cornea-ICL）and the central vault were measured with the AS-OCT system and the UBM system.Intraclass correlation coefficient（ICC）and the Bland-Altman plot were used to evaluate the repeatability and agreement of two devices.·R ESULTS：The mean ACD,cornea-ICL and central vault in the 52 phakic eyes after ICL surgery was 3.19±0.28 mm,2.47±0.28 mm,0.50±0.19 mm by AS-OCT and3.13±0.25 mm,2.49±0.25 mm,0.44±0.19 mm by UBM,respectively.Pairwise comparison of ACD and central vault measurements showed significant differences between AS-OCT and UBM（〈0.05）.However,no statistically significant difference was found between these imaging techniques in cornea-ICL（〉0.05）.The Pearson correlation coefficient（）between AS-OCT and UBM measurements for ACD,cornea-ICL and vault was0.88,0.80 and 0.89,respectively（〈0.001）.The ICC was0.89-0.94 for the measurements of AS-OCT and UBM.Bland-Altman analysis showed the 95%limits of agreement of ACD,cornea-ICL,central vault measurements between these two devices were-0.20 to 0.32 mm,-0.36to 0.32 mm and-0.12 to 0.24 mm,respectively.58·CONCLUSION：Central ACD and vault measurements using AS-OCT demonstrated a slight significantly higher value than using UBM in phakic eyes after ICL surgery.These two devices should not be used interchangeably for measurements of central ACD and vault in patients after phakic intraocular lens implantation.

前节OCT和pentacam及A超在测量角膜厚度上的比较

目的:对比分析前节OCT、pentacam三维眼前节分析仪及A超在测量角膜厚度上的差异性。方法:回顾研究2013-01/05在我院行准分子激光近视矫正手术的患者43例86眼。利用前节OCT、pentacam以及A超测量患者的角膜厚度,对三组数据对比分析,利用配对t检验以及相关分析进行统计学分析。结果:前节OCT、pentacam及A超测量患者的中央角膜厚度分别为535±52,550±52,550±51μm。配对t检验提示前节OCT和pentacam及A超测量结果均具有统计学差异(P<0.01),而pentacam和A超测量结果配对t检验提示无统计学差异(P=0.82)。三种测量结果均具有显著相关性,其相关性依次为:pentacam和A超为0.998,前节OCT和A超为0.993,而前节OCT和pentacam为0.991(P<0.01)。结论:前节OCT测量角膜中央厚度结果偏薄,而pentacam测量结果和作为金标准的A超结果相近。

前房生物学参数测量进展

前房生物学参数测量在疾病诊断和治疗中具有重要临床意义。近年检测前房生物学参数的仪器迅速发展,如Pentacam三维眼前节分析仪、眼前节相干光断层扫描仪、OrbscanⅡ眼前节分析诊断系统、超声生物显微镜等,为临床疾病诊断提供了客观依据。对目前临床常用的可测量前房生物学参数的仪器的原理、测量参数、优缺点及其在眼科领域的应用进行了综述。在临床实践中,应根据患者的临床表现、疾病诊断、患者舒适度、检查的部位等选择合适的检查仪器。