带有角膜瘢痕的外伤性白内障人工晶状体屈光度计算探讨  

The study of IOL power calculation in traumatic cataract

作　　者：郑广瑛[1] 曾强[1] 温成林[2] 

机构地区：[1]郑州大学第一附属医院眼科,河南郑州450052 [2]河南省三门峡市中心医院眼科

出　　处：《中国实用眼科杂志》2008年第4期320-322,共3页Chinese Journal of Practical Ophthalmology

摘　　要：目的探讨合并有角膜瘢痕的外伤性白内障人工晶状体（intraocularlens，IOL）屈光度精确的计算方法。方法对行超声乳化术治疗的合并有角膜瘢痕的外伤性白内障患者51例（51只眼）进行前瞻性研究。对于同一患者，收集其术前应用Orbscan-Ⅱ所测得的患眼5mm光学区角膜曲率值，并代入SRK／T公式计算得到的IOL屈光度为实验组；收集其术前用角膜曲率计测量的健眼角膜曲率值，并代入SRK／T公式计算所得到的IOL屈光度为对照组（术中按常规以此组结果植入IOL）；收集其术后3个月行电脑和检影验光获得的患眼屈光状态，并折算为等效球镜值，以植入的IOL屈光度＋等效球镜值×1．25得到的IOL屈光度为标准组。比较各组间IOL屈光度的差别。结果实验组与对照组IOL屈光度比较，两者差异具有统计学意义（P〈0．05）；标准组与对照组IOL屈光度比较，两者差异亦具有统计学意义（P〈0．05）。实验组与标准组IOL屈光度比较，其差异无统计学意义。结论对合并有角膜瘢痕的外伤性白内障，应用Orbscan-Ⅱ测得的角膜曲率值计算IOL屈光度更接近患眼的屈光状态。Objective To study the precise method of IOL power calculation in traumatic cataract with corneal scar.Methods In this prospective study ,51 eyes of 51 cases of traumatic cataract with corneal scar were underwent phacoemulsification and IOL implantation by identical operator .The preoperative corneal curvature value surveyed by Orbscan- Ⅱ corneal topograph and the corresponding IOL power which was caculated with SRK/T formula were collected, as experimental group. Meanwhile the normal ocular corneal curvature value surveyed by manu-keratometer and the corresponding IOL power were also collected, as control group （IOL were implanted according to the results in operation）. 3 months after operation the cases accepted computer and retinoscopy optometry examination.The results of refractive error were converted into the degree of equivalent spherical glass,then the degree × 1.25 was added to the IOL power which had been implantated, the final results were as the standarded group. At last, these data were compared. Results The control group compared with the experimental group ,the data were significant difference.The result was same between the control group and the standard group.But the experimental group compared with the standard group ,the data were not different.Conclusions Caculating IOL power with the coneal curvature value surveyed by Orbscan- Ⅱ corneal topography is a better method to traumatic cataract with corneal scar. it can reduce the refractive error after operation.

关 键 词：眼外伤 白内障 Orbscan-Ⅱ 晶体 人工 屈光度 

分 类 号：R776.1[医药卫生—眼科] R778.2[医药卫生—临床医学]