论文部分内容阅读
目的:探索人正常晶状体前表面的地形特征。方法:使用三坐标测量仪扫描8只人离体眼球晶状体前表面,通过图形软件surfacerv10.0将扫描获得的数据重建晶状体前表面,计算获取晶状体前表面地形图。测量出晶状体前表面各处的曲率半径,并作两因素方差分析。计算离晶状体前表面中心点不同距离处的平均曲率半径,并和离中心点的距离作曲线回归。计算晶状体表面非对称性指数(Lens Surface Asymmetric Index,LSAI)。转换坐标系后,将晶状体前表面水平经线和垂直经线各点作圆、椭圆、抛物线、双曲线等的曲线拟合。结果:人晶状体前表面地形图显示中央区较陡峭(中心曲率半径9.09±0.80mm),往周边区逐渐平坦(周边曲率半径17.05±2.20mm)。每个晶状体前表面各处的曲率半径作两因素方差分析均有统计学差异(P<0.05)。离晶状体前表面中心点不同距离处的平均曲率半径和距离作曲线回归显示两者间为三次幂函数关系。LSAI从晶状体前表面中央(0.013±0.005)至周边(0.184±0.065)逐渐增大。晶状体前表面水平经线和垂直经线作曲线拟合的决定系数为双曲线最大(0.9989-0.9999)。结论:人晶状体前表面地形图近似为圆形,但并非完美的旋转对称,晶状体前表面越靠近中心对称性越好。晶状体前表面由中央区至周边区逐渐变平坦,而且曲率半径呈现加速变大趋势。人晶状体前表面曲线最接近于双曲线。
Objective: To explore the topographical features of human normal lens. Methods: The surface of the anterior surface of the lens of the eye was scanned with a coordinate measuring instrument. The surface of the lens was reconstructed by the surfacerv10.0 software. The topography of the anterior surface of the lens was calculated. The radius of curvature of the anterior lens was measured and analyzed by two-way ANOVA. Calculate the average radius of curvature at different distances from the center of the anterior surface of the lens and curve back the distance from the center point. Lens Surface Asymmetric Index (LSAI) was calculated. After the coordinate system is converted, the curve of the circle, ellipse, parabola, hyperbola and the like of the horizontal warp and the vertical warp of the front lens are fitted. Results: The topography of the anterior surface of the human lens showed a steeper central region (9.09 ± 0.80mm in central radius of curvature) and a gradual flattened peripheral region (17.05 ± 2.20mm in peripheral radius). The radii of curvature around the anterior surface of each lens were analyzed by two-factor analysis of variance (P <0.05). The average radius of curvature and distance at different distances from the center of the anterior face of the lens are plotted as a curve of regression to show a power function relationship between the two. LSAI gradually increased from the center of the anterior surface of the lens (0.013 ± 0.005) to the periphery (0.184 ± 0.065). The decision coefficient for curve fitting of the horizontal warp and vertical warp of the anterior lens is the largest hyperbolic (0.9989-0.9999). CONCLUSIONS: The topography of the anterior surface of the human lens is approximately circular but not perfect rotational symmetry. The closer the lens front surface is to the center, the better symmetry. The front surface of the lens gradually flattened from the central area to the peripheral area, and the radius of curvature showed a trend of acceleration and enlargement. The curve of the front surface of the human lens is closest to the hyperbola.