中华眼视光学与视觉科学杂志
中華眼視光學與視覺科學雜誌
중화안시광학여시각과학잡지
CHINESE JOURNAL OF OPTOMETRY OPHTHALMOLOGY AND VISUAL SCIENCE
2013年
11期
662-666
,共5页
角膜%Q值%正切曲率半径%曲线拟合计算
角膜%Q值%正切麯率半徑%麯線擬閤計算
각막%Q치%정절곡솔반경%곡선의합계산
Cornea%Q-value%Tangential radius%Curve fitting calculations
目的 运用正切曲率半径结合曲线拟合计算,推算角膜半子午线Q值并进行区间整合,对青年近视角膜前表面Q值规律及特性进行分析.方法 横断面研究. 16～30岁近视受检者90例(90眼)行OrbscanⅡ角膜地形图检查,均取右眼,受检者平均等效球镜度为(-5.45±2.75)D.采集并导出角膜前表面间隔0.1 mm的360条半子午线正切曲率值Ft.将所需计算半子午线截痕上的所有Ft值代入正切曲率半径公式,应用线性回归方法结合Matlab R2009b(矩阵实验室Matrix Laboratory)系统拟合计算并通过计算机编程的模型处理系统计算得到各半子午线Q值,并进行区间整合、分析.结果 90眼水平方向鼻侧和颞侧2个区间平均Q值分别为-0.32±0.11、-0.30±0.12,差异有统计学意义(t=2.009,P＜0.05).72眼经过Matlab系统进行拟合计算得到的曲线决定系数R2均大于0.9.拟合前后水平鼻侧、颞侧区间平均Q值差异无统计学意义(鼻侧t=1.299,P＞0.05;颞侧t=0.848,P＞0.05).拟合后垂直上方、下方区间Q值平均值为-0.26±0.12、-0.21±0.23.结论 采用线性回归方法结合拟合计算可以由角膜地形图正切曲率半径推算角膜前表面Q值和区间Q值.近视青年角膜前表面形态趋向于长椭圆,垂直方向较水平方向更趋向于圆形.
目的 運用正切麯率半徑結閤麯線擬閤計算,推算角膜半子午線Q值併進行區間整閤,對青年近視角膜前錶麵Q值規律及特性進行分析.方法 橫斷麵研究. 16～30歲近視受檢者90例(90眼)行OrbscanⅡ角膜地形圖檢查,均取右眼,受檢者平均等效毬鏡度為(-5.45±2.75)D.採集併導齣角膜前錶麵間隔0.1 mm的360條半子午線正切麯率值Ft.將所需計算半子午線截痕上的所有Ft值代入正切麯率半徑公式,應用線性迴歸方法結閤Matlab R2009b(矩陣實驗室Matrix Laboratory)繫統擬閤計算併通過計算機編程的模型處理繫統計算得到各半子午線Q值,併進行區間整閤、分析.結果 90眼水平方嚮鼻側和顳側2箇區間平均Q值分彆為-0.32±0.11、-0.30±0.12,差異有統計學意義(t=2.009,P＜0.05).72眼經過Matlab繫統進行擬閤計算得到的麯線決定繫數R2均大于0.9.擬閤前後水平鼻側、顳側區間平均Q值差異無統計學意義(鼻側t=1.299,P＞0.05;顳側t=0.848,P＞0.05).擬閤後垂直上方、下方區間Q值平均值為-0.26±0.12、-0.21±0.23.結論 採用線性迴歸方法結閤擬閤計算可以由角膜地形圖正切麯率半徑推算角膜前錶麵Q值和區間Q值.近視青年角膜前錶麵形態趨嚮于長橢圓,垂直方嚮較水平方嚮更趨嚮于圓形.
목적 운용정절곡솔반경결합곡선의합계산,추산각막반자오선Q치병진행구간정합,대청년근시각막전표면Q치규률급특성진행분석.방법 횡단면연구. 16～30세근시수검자90례(90안)행OrbscanⅡ각막지형도검사,균취우안,수검자평균등효구경도위(-5.45±2.75)D.채집병도출각막전표면간격0.1 mm적360조반자오선정절곡솔치Ft.장소수계산반자오선절흔상적소유Ft치대입정절곡솔반경공식,응용선성회귀방법결합Matlab R2009b(구진실험실Matrix Laboratory)계통의합계산병통과계산궤편정적모형처리계통계산득도각반자오선Q치,병진행구간정합、분석.결과 90안수평방향비측화섭측2개구간평균Q치분별위-0.32±0.11、-0.30±0.12,차이유통계학의의(t=2.009,P＜0.05).72안경과Matlab계통진행의합계산득도적곡선결정계수R2균대우0.9.의합전후수평비측、섭측구간평균Q치차이무통계학의의(비측t=1.299,P＞0.05;섭측t=0.848,P＞0.05).의합후수직상방、하방구간Q치평균치위-0.26±0.12、-0.21±0.23.결론 채용선성회귀방법결합의합계산가이유각막지형도정절곡솔반경추산각막전표면Q치화구간Q치.근시청년각막전표면형태추향우장타원,수직방향교수평방향경추향우원형.
Objective To calculate the Q-values of the meridian sections of the anterior corneal surface based on the tangential radius and curve-fitting calculations; to analyze the distribution of the Q-values and the characteristics of the anterior corneal surface in young myopes.Methods This was a cross-sectional study.Ninety right eyes of 90 myopia subjects with an age range of 16-30 years and mean spherical equivalent of-5.45±2.75 D underwent corneal topography examinations using the Orbscan Ⅱ system.The tangential curvatures along the meridian section at 0.1 mm intervals from the apex to the periphery of the anterior surface were calculated and the Q-values of the semi-meridian section were calculated by linear regression of the tangential radius.Matlab R2009b (Matrix Laboratory) was used for curve fitting calculations.Results The average calculated Q-values on the nasal and temporal horizontal intervals were-0.32±0.11 and-0.30±0.12,with a significant difference between them (t=2.009,P＜0.05).The coefficients of determination for curve fitting calculations in all the semi-meridians were over 0.9 based on Matlab R2009b (Matrix Laboratory) for 72 eyes.There were no significant differences before and after curve fitting calculations (nasal:t=1.299,P＞0.05; temporal:t=0.848,P＞0.05).The average calculated Q-values along the superior and inferior intervals were-0.26±0.12 and-0.21±0.23,respectively.Conclusion This study analyzes the calculated Q-values of the semi-meridian section in myopes based on the linear regression of the tangential radius using tangential topography and curve-fitting calculations.The anterior corneal surface proved to be a prolate elliptical shape in subjects with myopia.The vertical meridians were more round.
