近视眼角膜非球面特性及其相关因素分析  

The corneal asphericity and its related factors in myopic eyes

作　　者：严宗辉[1] 黎霞[1] 史赛卿[2] 胡建荣[1] 顾宝文[1] 张醇[1] 

机构地区：[1]暨南大学医学院深圳眼科中心深圳市眼科医院,深圳518001 [2]深圳市妇幼保健院

出　　处：《中国实用眼科杂志》2006年第9期893-895,共3页Chinese Journal of Practical Ophthalmology

基　　金：深圳市科技计划资助项目(JH200505310595A)

摘　　要：目的探讨近视眼角膜非球面特性及其相关因素。方法利用ALLEGRO角膜地形图仪对70例(140眼)Lasik前、后近视患者进行检测,获取角膜顶点30°偏心率(ε)和角膜非球面特性参数Q值,并对Q值与屈光度、角膜曲率和角膜直径等因素进行相关分析。结果140只眼Q值呈正态分布,平均-0.32±0.10(-0.08～-0.62)。Q值与等效球镜之间有较弱负线性相关关系,与角膜曲率、Z40、角膜散光(ΔK)均有直线相关关系。水平子午线Q值与角膜水平直径有正线性相关关系。但是Q值与性别、年龄、角膜厚度、眼压之间无相关关系。Lasik后Q值均呈正值,术后1个月的Q值分布为0～1.34,平均0.67±0.32。结论Q值在眼光学系统中不是一个独立的参数,它与眼多个因素有关,Lasik显著改变了Q值,可能会影响手术后眼视觉质量。Objective To observe the corneal asphericity and its related factors in myopic eyes. Methods To examine the eccentricity（ ε ） within 30° ,vertex of cornea and the Q value of the corneal asphericity on 70 myopic patients （140 eyes） before and after LASIK by ALLEGRO topolyzer.And analyzed the relationship between Q value with refractive error, cornea curvature, cornea diameter and so on. Results The Q value distributes as positive normal distributing,the average of Q value was -0.32± 0.10（range -0.08N-0.62）. Poor negative relationship was found between Q value and spherical equivalent.The Q value show line related with cornea curvature,Z4^0 and cornea astigmatism.The Q value along the horizontal meridian showed positive line related with the horizontal meridian diameter of cornea.But the Q value was not related with gender, age, cornea thickness and ocular pressure.After LASIK,the Q value was positive,and the average of Q value was 0.67 ± 0.32（range 0-1.34） after 1 month of operation. Conclusion The Q value was not an absolute parameter, it was related with many fators. The Q value was marked changed by LASIK and the change would influence the vision quality postoperation.

关 键 词：角膜 Q值 激光原位角膜磨镶术 

分 类 号：R779.63[医药卫生—眼科]