角膜表面非球面形态数字表达研究的沿革

角膜表面的非球面形态特性一直是眼科临床上一个受关注的课题。笔者阐述和讨论了用角膜地形图仪高度图数据建立角膜表面的模型技术，以及用角膜曲率半径值包括角膜地形图轴向图与正切图数据来计算角膜表面的Q值技术。提出应用角膜地形图正切图数据进行偏微分和拟合处理，计算半子午线截痕的Q值，以及采用坐标旋转技术计算出所有半子午线Q值的技术，解决了Q值计算的精确性和定位性问题。所有应用该技术的报道都表明样本研究的结果具有理想的精确性和稳定性。

The development of the study on the expression of corneal asphericity

Corneal asphericity has been a topic in clinical ophthalmology. This article discusses a corneal surface model based on corneal topography height data， as well as the Q value calculated by tangential data and axial data. The method of using the tangential data， which can be used to calculate the Q-values of all the semi-meridians by coordinate circumrotation， solved the problem of the accuracy and positioning of calculated Q-value. Related firdings support the accuracy and stability of this method.