眼球跟踪系统减少LASIK术后切削区偏中心的作用  

To evaluate the effect of optical ablation zone decentration after LASIK with active eye tracking system.

作　　者：刘美光[1] 马玉娜[1] 李爱华[2] 王传富[1] 

机构地区：[1]青岛大学医学院附属医院眼科,山东青岛266003 [2]昌邑市人民医院眼科,山东昌邑261300

出　　处：《眼外伤职业眼病杂志》2008年第8期612-614,共3页Journal of Injuries and Occupational Diseases of the Eye with Ophthalmic Surgeries

摘　　要：目的探讨准分子激光原位角膜磨镶术(LASIK)中眼球跟踪系统减少切削区偏中心的作用。方法LASIK175例350眼,术前及术后采用计算机辅助角膜地形图分析系统进行检查,根据手术前后图上的差异,测定光学切削区偏中心距离及方位,并结合术前屈光度及手术对位方式与术后偏中心距离分组进行比较。结果350眼分为低、中度近视组(屈光度≤-6.00D)A1组(手控对位),A2组(跟踪对位);高度及超高度近视组(屈光度-6.25D^-10.00D)B1组(手控对位),B2组(跟踪对位)等4个组。按术后偏中心距离,分为Ⅰ级(≤0.25 mm)、Ⅱ级(>0.25 mm~≤0.5 mm)及Ⅲ级(>0.5 mm)。偏中心距离Ⅲ级者均为手控对位组,其中A1组2.56%(2/78眼)、B1组8.33%(6/72眼),且术后裸眼视力均低于术前最佳矫正视力;偏中心距离A1、A2两组比较差异无统计学意义(P>0.05),B1、B2两组比较差异有统计学意义(P<0.05)。两组偏中心方位大部分位于鼻上象限,差异无统计学意义(χ2=1.0583,P>0.05)。结论主动眼球跟踪系统能减少光学切削区偏中心,对高度近视患眼尤为重要。Objective To analyse the optical ablation zone decentration in patients who have undergone excimer laser in situ keratomileusis （LASIK） and try to find the reasons and prevention of the optical ablation zone decentration. Methods Optical ablation zone centration in 350 eyes before and after LASIK was tested using computer-assisted videokeratography. On the differential maps, we messured distance and directions of the optical ablation zone decentration, and compared decentration mounts among these eyes. Results 350 eyes were divided into low and medium myyopia （diopter ≤ -6.00D） A1 （no active eye tracking system ） , B1 （with active eye tracking system ） group and high and super-high myopia （diopter -6.25 ～ -10.00D） A2 （no active eye tracking system）. B2 （with active eye tracking system） group; according decentration distance, all eyes divided into Ⅰ class （ ≤0. 25 mm）, Ⅱ class （ 〉0.25 mmand ≤0.5 mm ） and Ⅲ class （ 〉 0. 5 mm）. The amount of eyes in m class are 3 % （2/78 eyes ） in A1 group and 8% （6/72 eye） in B1 group; and in these eyes the postoperative uncorrected visual acuity worse than the preoperative corrected visual acuity; for the decentration distance, there is no different statistically significant between group A1 and A2; there was different statistically significant between group B1 and B2. For the direction of the optical ablation zone decentration, there was no difference among the various degree myopic eyes （χ2 = 1. 0583, P 〉 0. 05 ）. Most points of deventration were located in supranasal area. Conclusions The major reason for the dcentrtion may due to the decreasing of the corneal clarity during the surgery. The active eye tracking system can reduce the decentration, so is especially important to those of high and super-high myopia patients.

关 键 词：主动眼球跟踪 准分子激光原位角膜磨镶术 近视 光学切削区 偏中心 

分 类 号：R779.63[医药卫生—眼科]