| 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，它跟眼多个因素有关，Lasik显著改变了Q值，可能会影响手术后眼视觉质量。
【关键词】 角膜； Q值； 原位角膜磨镶术
The corneal asphericity and its related factors in myopic eyes. YAN zong-hui,LI xia,HU jian-rong,SHI sai-qin,GU bao-wen,ZHUANG chun.Shenzhen Ophthalmic Center,Jinan University,Shenzhen 518001.China
【Abstract】 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 -0.08～-0.62).Poor negative relationship was found between Q value and spherical equivalent.The Q value show line related with cornea curvature、Z40 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.
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