正视儿童角膜前表面非球面Q值分析  

Analysis of the Q-value of corneal surface asphericity in emmetropic children

作　　者：王爱君[1] 王波[2] 施明光[1] 

机构地区：[1]温州医学院附属第二医院眼科,325027 [2]南京财经大学,210003

出　　处：《中华眼视光学与视觉科学杂志》2012年第7期418-421,共4页Chinese Journal Of Optometry Ophthalmology And Visual Science

基　　金：国家自然科学基金（30872816）

摘　　要：目的运用正切曲率半径计算正视眼儿童角膜前表面Q值并分析其分布特性。方法横断面研究。检查采集33例（65眼）正视眼儿童Obscan—Ⅱ角膜地形图数据和正切图的曲率数据，间隔1。分成360条子午线，在距离角膜中央4．5mm内间隔0．1mm取点，读出所有点的角膜前表面正切曲率值，依据二次曲线方程组和直线拟合方法，计算各子午线截痕的Q值。采用配对t检验分别比较左、右眼四个15。区间的Q值。结果结果显示，65眼角膜前表面的四个15。区间Q值都呈正态分布，均为小于0大于-1的负小数值，即角膜前表面截痕呈长椭圆形态。右眼四个150区间0值分别为：鼻侧（33眼）-0．3659±0．1064，颞侧（31眼）-0．2456±0．1015，上方（28眼）-0．2786±0．0813，下方（19眼）-0．2059±0．0704。左眼四个15。区间Q值分别为：鼻侧（32眼）-0．4529＋0．1327。颞侧（27眼）-0．2249±0．0907，上方（26眼）-0．2939±0．0704，下方（18眼）-0．2321±0．0849。结论正视眼儿童组角膜前表面双眼Q值均表现为依次从鼻侧、上方、颞侧至下方的小数值负性逐渐变少的趋势。Objective To analyze the distribution of corneal surface Q-value in children without ammetropia calculated by tangential radius. Methods It was a cross-sectional study. The corneal topography of 65 eyes from 33 emmetropic children was examined by Obscan-11 and the tangential curvature data was guided by computer. The distance between two adjacent data points was 0.1 mm for all 360 semi-meridians within 4.5 mm of the corneal vertex. The Q-values of the 360 semi-meridians were calculated by the tangential radius from the tangential map based on a conic mathematical formula and linear regression method. Data were analyzed with a paired t test. Results The result of Q-value analysis showed that the 15° region in the Q-value distribution of the samples in both right and left eyes was normal. Negative values from all sections of the corneal surface show the prolate shape. The Q-value distribution of the four 15° regions was as follows： for right eyes： nasal （33 eyes） -0.3659±0.1064, temporal （31 eyes） -0.2456±0.1015, superior （28 eyes） -0.2786± 0.0813, inferior （19 eyes） -0.2059±0.0704; for left eyes： nasal （32 eyes） -0.4529±0.1327, temporal （27 eyes） -0.2249±0.0907, superior （26 eyes） -0.2939±0.0704, inferior （18 eyes） -0.2321±0.0849. Conclusion This study reveals the shape of the corneal surface of emmetropic children. The 15° region Q-values of both fight and left eyes become gradually less negative in order from the nasal, superior, temporal to inferior regions.

关 键 词：角膜前表面 Q值 正切曲率半径 正视 儿童 

分 类 号：R779.63[医药卫生—眼科]