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目的 了解学龄儿童角膜非球面光学特性及其相关因素.设计 横断面研究.研究对象 对北京市昌平区7所小学、初中、高中进行整群抽样,随机抽取学龄儿童(7～16岁)950名.年龄为(10.87±2.58)岁.方法 采用Aladdin眼前节生物测量仪对儿童进行角膜Q值及眼部生物学测量,观察Q值的分布特征及其与眼部参数(眼轴、眼压、角膜曲率、球差等)和全身参数(年龄、性别、身高、体重)的相关性.主要指标 角膜Q值、球差、慧差、角膜曲率、眼轴、眼压、角膜水平直径、前房深度.结果 角膜Q值平均为-0.18±0.14,呈正态分布;Q值在性别(P=0.839)眼别(P--0.373)之间无统计学差异;与年龄(r=0.110,P=0.000)、身高(r=0.118,P=0.000)、体重(r=0.117,P=0.000)、球差(r=0.113,P=0.001)、慧差(r=0.087,P=-0.009)呈正相关,其中7～11岁年龄段角膜Q值较12～16岁年龄段小(t=-5.51,P=0.000);角膜Q值与角膜曲率、角膜水平直径、前房深度、眼轴、眼压无相关性(P均＞0.05).结论 学龄儿童角膜前表面形态呈长椭圆形,角膜Q值与年龄、身高、体重、球差、慧差呈正相关.“,”Objective To study the distribution characters of corneal asphericity (Q-value) in school-age children and the related factors.Design Cross-sectional study.Participants Using a random cluster sampling method,in total 950 students from 7 schools in Changping district,Beijing aged between 7 to 16 (10.87±2.58) were studied.Methods Aladdin anterior segment system was used to both obtain the Q-value and ocular biometry measurements of the children and conduct relevant analysis regarding distribution characters,ocular parameters (eye axis,intraocular pressure,corneal curvature,spherical aberration) as well as whole body parameter (age,sex,height,weight).Main outcome measures cornea Q value,spherical aberration,coma,corneal curvature,ocular axis,intraocular pressure,corneal horizontal diameter,anterior chamber depth.Results the mean Q value was-0.18±0.14 with normal distribution.The Q values of different genders (P=0.839) and different eyes (P=0.373) were not statistically different.The Q values was correlated with age (r=0.110,P=0.000),height (r=0.118,P=0.000),weight (r--0.117,P=0.000),spherical aberration (r=0.113,P=0.001),coma (r=0.087,P=0.009).The Q values of children aged 7～11 group is significantly smaller than that of 12～16 group (t=-5.51,P=-0.000).No significant relation was found between Q value and either sphere,corneal curvature,corneal horizontal diameter,anterior chamber depth,ocular axis,and intraocular pressure (all P＞0.05).Conclusion The morphology of the corneal anterior surface of school age children is oval.The Q values is positively correlated with age,height,weight,spherical aberration and coma.